aboutsummaryrefslogtreecommitdiffstats
path: root/test/rfc7230_SUITE.erl
blob: e11044181ed2a8098956f8f478e0f4e491f9f920 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
%% Copyright (c) 2015-2017, Loïc Hoguin <[email protected]>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

-module(rfc7230_SUITE).
-compile(export_all).
-compile(nowarn_export_all).

-import(ct_helper, [doc/1]).
-import(cowboy_test, [gun_open/1]).
-import(cowboy_test, [gun_down/1]).
-import(cowboy_test, [raw_open/1]).
-import(cowboy_test, [raw_send/2]).
-import(cowboy_test, [raw_recv_head/1]).
-import(cowboy_test, [raw_recv/3]).

suite() ->
	[{timetrap, 30000}].

all() -> [{group, http}].

groups() -> [{http, [parallel], ct_helper:all(?MODULE)}].

init_per_group(Name = http, Config) ->
	cowboy_test:init_http(Name = http, #{
		env => #{dispatch => cowboy_router:compile(init_routes(Config))},
		max_keepalive => 100
	}, Config).

end_per_group(Name, _) ->
	ok = cowboy:stop_listener(Name).

init_routes(_) -> [
	{"localhost", [
		{"/", hello_h, []},
		{"/echo/:key[/:arg]", echo_h, []},
		{"/full/:key[/:arg]", echo_h, []},
		{"/length/echo/:key", echo_h, []},
		{"/resp/:key[/:arg]", resp_h, []},
		{"/send_message", send_message_h, []},
		{"*", asterisk_h, []}
	]},
	{"127.0.0.1", [{"/echo/:key", echo_h, []}]},
	{"example.org", [{"/echo/:key", echo_h, []}]}
%% @todo Add IPv6 addresses support to the router. This fails:
%%	{"[2001:db8:85a3::8a2e:370:7334]", [{"/echo/:key", echo_h, []}]}
].

do_raw(Config, Data) ->
	Client = raw_open(Config),
	ok = raw_send(Client, Data),
	{Version, Code, Reason, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, Rest2} = cow_http:parse_headers(Rest),
	case lists:keyfind(<<"content-length">>, 1, Headers) of
		{_, LengthBin} when LengthBin =/= <<"0">> ->
			Length = binary_to_integer(LengthBin),
			Body = if
				byte_size(Rest2) =:= Length -> Rest2;
				true ->
					{ok, Body0} = raw_recv(Client, Length - byte_size(Rest2), 5000),
					<< Rest2/bits, Body0/bits >>
			end,
			#{client => Client, version => Version, code => Code, reason => Reason, headers => Headers, body => Body};
		_ ->
			#{client => Client, version => Version, code => Code, reason => Reason, headers => Headers, body => <<>>}
	end.

%% Listener.

%% @todo Add to documentation.
%The default port for "http" connections is 80. The connection
%uses plain TCP. (RFC7230 2.7.1)
%
%The default port for "https" connections is 443. The connection
%uses TLS. (RFC7230 2.7.2)
%
%Any other port may be used for either of them.

%% Before the request.

accept_at_least_1_empty_line(Config) ->
	doc("A configurable number of empty lines (CRLF) preceding the request "
		"must be ignored. At least 1 empty line must be ignored. (RFC7230 3.5)"),
	#{code := 200} = do_raw(Config,
		"\r\n"
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_response(Config) ->
	doc("When receiving a response instead of a request, identified by the "
		"status-line which starts with the HTTP version, the server must "
		"reject the message with a 400 status code and close the connection. (RFC7230 3.1)"),
	#{code := 400, client := Client} = do_raw(Config,
		"HTTP/1.1 200 OK\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Request.

only_parse_necessary_elements(Config) ->
	doc("It is only necessary to parse elements required to process the request. (RFC7230 2.5)"),
	#{code := 200} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-type: purposefully bad header value\r\n"
		"\r\n").

%% @todo Add to documentation.
%Parsed elements are subject to configurable limits. A server must
%be able to parse elements at least as long as it generates. (RFC7230 2.5)

no_empty_line_after_request_line(Config) ->
	doc("The general format of HTTP requests is strict. No empty line is "
		"allowed in-between components except for the empty line "
		"indicating the end of the list of headers."),
	#{code := 400} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"\r\n"
		"Host: localhost\r\n"
		"\r\n").

no_empty_line_in_headers(Config) ->
	doc("The general format of HTTP requests is strict. No empty line is "
		"allowed in-between components except for the empty line "
		"indicating the end of the list of headers."),
	#{code := 400} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"User-Agent: RFC7230\r\n"
		"\r\n"
		"Host: localhost\r\n"
		"\r\n").

timeout_before_request_line(Config) ->
	doc("The time the request (request line and headers) takes to be "
		"received by the server must be limited and subject to configuration. "
		"No response must be sent before closing if no request was initiated "
		"by the reception of a complete request-line."),
	Client = raw_open(Config),
	ok = raw_send(Client, "GET / HTTP/1.1\r"),
	{error, closed} = raw_recv(Client, 0, 6000).

timeout_after_request_line(Config) ->
	doc("The time the request (request line and headers) takes to be "
		"received by the server must be limited and subject to configuration. "
		"A 408 status code must be sent if the request line was received."),
	#{code := 408, client := Client1} = do_raw(Config, "GET / HTTP/1.1\r\n"),
	{error, closed} = raw_recv(Client1, 0, 6000).

timeout_after_request_line_host(Config) ->
	doc("The time the request (request line and headers) takes to be "
		"received by the server must be limited and subject to configuration. "
		"A 408 status code must be sent if the request line was received."),
	#{code := 408, client := Client2} = do_raw(Config, "GET / HTTP/1.1\r\nHost: localhost"),
	{error, closed} = raw_recv(Client2, 0, 6000).

timeout_after_request_line_host_crlf(Config) ->
	doc("The time the request (request line and headers) takes to be "
		"received by the server must be limited and subject to configuration. "
		"A 408 status code must be sent if the request line was received."),
	#{code := 408, client := Client3} = do_raw(Config, "GET / HTTP/1.1\r\nHost: localhost\r\n"),
	{error, closed} = raw_recv(Client3, 0, 6000).

timeout_after_request_line_host_crlfcr(Config) ->
	doc("The time the request (request line and headers) takes to be "
		"received by the server must be limited and subject to configuration. "
		"A 408 status code must be sent if the request line was received."),
	#{code := 408, client := Client4} = do_raw(Config, "GET / HTTP/1.1\r\nHost: localhost\r\n\r"),
	{error, closed} = raw_recv(Client4, 0, 6000).

%% Request line.

limit_request_line_8000(Config) ->
	doc("It is recommended to limit the request-line length to a configurable "
		"limit of at least 8000 octets."),
	LongPath = ["/long-path" || _ <- lists:seq(1, 799)],
	#{code := 200} = do_raw(Config, [
		"GET /?qs=", LongPath, " HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]).

limit_request_line_9000(Config) ->
	doc("It is recommended to limit the request-line length to a configurable "
		"limit of at least 8000 octets. A request line too long must be rejected "
		"with a 414 status code and the closing of the connection. (RFC7230 3.1.1)"),
	LongPath = ["/long-path" || _ <- lists:seq(1, 899)],
	#{code := 414, client := Client} = do_raw(Config, [
		"GET /very", LongPath, " HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Method.

reject_invalid_method(Config) ->
	doc("The request method is defined as 1+ token characters. An invalid "
		"method must be rejected with a 400 status code and the "
		"closing of the connection. (RFC7230 3.1.1, RFC7230 3.2.6)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET\0 / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_empty_method(Config) ->
	doc("The request method is defined as 1+ token characters. An empty "
		"method must be rejected with a 400 status code and the "
		"closing of the connection. (RFC7230 3.1.1, RFC7230 3.2.6)"),
	#{code := 400, client := Client} = do_raw(Config,
		" / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% @todo We probably want to directly match commonly used methods.
%In practice the only characters in use by registered methods are
%uppercase letters [A-Z] and the dash "-". (IANA HTTP Method Registry)

limit_method_name(Config) ->
	doc("The length of the method must be subject to a configurable limit. "
		"A method too long must be rejected with a 501 status code and the "
		"closing of the connection. A good default for the method length limit "
		"is the longest method length the server implements. (RFC7230 3.1.1)"),
	LongMethod = [$G || _ <- lists:seq(1, 1000)],
	#{code := 501, client := Client} = do_raw(Config, [
		LongMethod, " / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Between method and request-target.

reject_tab_between_method_and_request_target(Config) ->
	doc("A request that uses anything other than SP as separator between "
		"the method and the request-target must be rejected with a 400 "
		"status code and the closing of the connection. (RFC7230 3.1.1, RFC7230 3.5)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET\t/ HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_two_sp_between_method_and_request_target(Config) ->
	doc("A request that uses anything other than SP as separator between "
		"the method and the request-target must be rejected with a 400 "
		"status code and the closing of the connection. (RFC7230 3.1.1, RFC7230 3.5)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET  / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Request target.

ignore_uri_fragment_after_path(Config) ->
	doc("The fragment part of the target URI is not sent. It must be "
		"ignored by a server receiving it. (RFC7230 5.1)"),
	Echo = <<"http://localhost/echo/uri">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/uri#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

ignore_uri_fragment_after_query(Config) ->
	doc("The fragment part of the target URI is not sent. It must be "
		"ignored by a server receiving it. (RFC7230 5.1)"),
	Echo = <<"http://localhost/echo/uri?key=value">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/uri?key=value#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

%% Request target: origin-form.

must_understand_origin_form(Config) ->
	doc("A server must be able to handle at least origin-form and absolute-form. (RFC7230 5.3.2)"),
	#{code := 200} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

%% @todo Reenable this test once support for CONNECT is added.
%origin_form_reject_if_connect(Config) ->
%	doc("origin-form is used when the client does not connect to a proxy, "
%		"does not use the CONNECT method and does not issue a site-wide "
%		"OPTIONS request. (RFC7230 5.3.1)"),
%	#{code := 400, client := Client} = do_raw(Config,
%		"CONNECT / HTTP/1.1\r\n"
%		"Host: localhost\r\n"
%		"\r\n"),
%	{error, closed} = raw_recv(Client, 0, 1000).

%% @todo Equivalent test for https.
origin_form_tcp_scheme(Config) ->
	doc("The scheme is either resolved from configuration or is \"https\" "
		"when on a TLS connection and \"http\" otherwise. (RFC7230 5.5)"),
	Echo = <<"http://localhost/echo/uri">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/uri HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

origin_form_path(Config) ->
	doc("The absolute-path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/path HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

origin_form_path_query(Config) ->
	doc("The absolute-path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/path?key=value HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

origin_form_path_fragment(Config) ->
	doc("The absolute-path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/path#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

origin_form_query(Config) ->
	doc("The query starts with \"?\" and ends with \"#\" or the end of the URI. (RFC3986 3.4)"),
	Echo = <<"key=value">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/qs?key=value HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

origin_form_query_fragment(Config) ->
	doc("The query starts with \"?\" and ends with \"#\" or the end of the URI. (RFC3986 3.4)"),
	Echo = <<"key=value">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET /echo/qs?key=value#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

%% @todo origin_form: reject paths with too large depth or query strings with too many keys

%% Request target: absolute-form.

must_understand_absolute_form(Config) ->
	doc("A server must be able to handle at least origin-form and absolute-form. (RFC7230 5.3.2)"),
	#{code := 200} = do_raw(Config,
		"GET http://localhost HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_case_insensitive_scheme(Config) ->
	doc("The scheme is case insensitive and normally provided in lowercase. (RFC7230 2.7.3)"),
	Echo = <<"http://localhost/echo/uri">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET HttP://localhost/echo/uri HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_case_insensitive_host(Config) ->
	doc("The host is case insensitive and normally provided in lowercase. (RFC7230 2.7.3)"),
	Echo = <<"http://localhost/echo/uri">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://LoCaLHOsT/echo/uri HTTP/1.1\r\n"
		"Host: LoCaLHOsT\r\n"
		"\r\n").

absolute_form_reject_unknown_schemes(Config) ->
	doc("Unknown schemes must be rejected with a 400 status code and the closing of the connection."),
	#{code := 400, client := Client} = do_raw(Config,
		"GET bad://localhost/ HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% @todo Equivalent test for https.
absolute_form_drop_scheme_tcp(Config) ->
	doc("The scheme provided with the request must be dropped. The effective "
		"scheme is either resolved from configuration or is \"https\" when on "
		"a TLS connection and \"http\" otherwise. (RFC7230 5.5)"),
	Echo = <<"http://localhost/echo/uri">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET https://localhost/echo/uri HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_reject_userinfo(Config) ->
	doc("An authority component with a userinfo component (and its "
		"\"@\" delimiter) is invalid. The request must be rejected with "
		"a 400 status code and the closing of the connection. (RFC7230 2.7.1)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET http://username:[email protected] HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

absolute_form_reject_missing_host_without_path(Config) ->
	doc("A URI with a missing host identifier is invalid. The request must "
		"be rejected with a 400 status code and the closing of the connection. (RFC7230 2.7.1)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET http:// HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

absolute_form_reject_missing_host_with_path(Config) ->
	doc("A URI with a missing host identifier is invalid. The request must "
		"be rejected with a 400 status code and the closing of the connection. (RFC7230 2.7.1)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET http:/// HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

absolute_form_ipv4(Config) ->
	doc("Absolute form with an IPv4 address for the host. (RFC3986 3.2.2)"),
	Echo = <<"127.0.0.1">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://127.0.0.1/echo/host HTTP/1.1\r\n"
		"Host: 127.0.0.1\r\n"
		"\r\n").

absolute_form_ipv4_port(Config) ->
	doc("Absolute form with an IPv4 address for the host and a port number. (RFC3986 3.2.2)"),
	Host = <<"127.0.0.1">>,
	#{code := 200, body := Host} = do_raw(Config,
		"GET http://127.0.0.1:8080/echo/host HTTP/1.1\r\n"
		"Host: 127.0.0.1:8080\r\n"
		"\r\n"),
	Port = <<"8080">>,
	#{code := 200, body := Port} = do_raw(Config,
		"GET http://127.0.0.1:8080/echo/port HTTP/1.1\r\n"
		"Host: 127.0.0.1:8080\r\n"
		"\r\n").

%% @todo We need the router to support IPv6 addresses to write proper tests for these:
%absolute_form_ipv6(Config) ->
%absolute_form_ipv6_ipv4(Config) ->
%absolute_form_ipv6_zoneid(Config) ->

absolute_form_reg_name(Config) ->
	doc("Absolute form with a regular name for the host. (RFC3986 3.2.2)"),
	Echo = <<"example.org">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://example.org/echo/host HTTP/1.1\r\n"
		"Host: example.org\r\n"
		"\r\n").

absolute_form_reg_name_port(Config) ->
	doc("Absolute form with an IPv4 address for the host and a port number. (RFC3986 3.2.2)"),
	Host = <<"example.org">>,
	#{code := 200, body := Host} = do_raw(Config,
		"GET http://example.org:8080/echo/host HTTP/1.1\r\n"
		"Host: example.org:8080\r\n"
		"\r\n"),
	Port = <<"8080">>,
	#{code := 200, body := Port} = do_raw(Config,
		"GET http://example.org:8080/echo/port HTTP/1.1\r\n"
		"Host: example.org:8080\r\n"
		"\r\n").

absolute_form_limit_host(Config) ->
	doc("The maximum length for the host component of the URI must be subject "
		"to a configurable limit. A good default is 255 characters. "
		"(RFC7230 3.1.1, RFC3986 3.2.2, RFC1034 3.1)"),
	LongHost = ["host." || _ <- lists:seq(1, 100)],
	#{code := 414, client := Client} = do_raw(Config, [
		"GET http://", LongHost, "/ HTTP/1.1\r\n"
		"Host: ", LongHost, "\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

absolute_form_invalid_port_0(Config) ->
	doc("Port number 0 is reserved. The request must be rejected and the connection closed."),
	#{code := 400, client := Client} = do_raw(Config,
		"GET http://localhost:0/ HTTP/1.1\r\n"
		"Host: localhost:0\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

absolute_form_invalid_port_65536(Config) ->
	doc("Port numbers above 65535 are invalid. The request must be rejected "
		"and the connection closed."),
	#{code := 400, client := Client} = do_raw(Config,
		"GET http://localhost:65536/ HTTP/1.1\r\n"
		"Host: localhost:65536\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% @todo The RFC says to discard the Host header if we are a proxy,
%% and replace it with the content of absolute-form. This means
%% that we should probably keep the absolute-form value when
%% operating in proxy mode. Otherwise the absolute-form value
%% is simply dropped and the Host header is used.

%% @todo The authority is sent both in the URI and in the host header.
%% The authority from the URI must be dropped, and the host header
%% must be used instead. (RFC7230 5.5)
%%
%% It is not possible to test that the absolute-form value is dropped
%% because one of the Host header test ensures that the authority
%% is the same in both, and errors out otherwise.

absolute_form_path(Config) ->
	doc("The path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://localhost/echo/path HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_path_query(Config) ->
	doc("The path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://localhost/echo/path?key=value HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_path_fragment(Config) ->
	doc("The path always starts with \"/\" and ends with either \"?\", \"#\" "
		"or the end of the URI. (RFC3986 3.3)"),
	Echo = <<"/echo/path">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://localhost/echo/path#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_no_path(Config) ->
	doc("An empty path component is equivalent to \"/\". (RFC7230 2.7.3)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config,
		"GET http://localhost HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_no_path_then_query(Config) ->
	doc("An empty path component is equivalent to \"/\". (RFC7230 2.7.3)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config,
		"GET http://localhost?key=value HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_no_path_then_fragment(Config) ->
	doc("An empty path component is equivalent to \"/\". (RFC7230 2.7.3)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config,
		"GET http://localhost#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_query(Config) ->
	doc("The query starts with \"?\" and ends with \"#\" or the end of the URI. (RFC3986 3.4)"),
	Echo = <<"key=value">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://localhost/echo/qs?key=value HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

absolute_form_query_fragment(Config) ->
	doc("The query starts with \"?\" and ends with \"#\" or the end of the URI. (RFC3986 3.4)"),
	Echo = <<"key=value">>,
	#{code := 200, body := Echo} = do_raw(Config,
		"GET http://localhost/echo/qs?key=value#fragment HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n").

%% @todo absolute_form: reject paths with too large depth or query strings with too many keys

%% Request-target: authority-form.

authority_form_reject_if_not_connect(Config) ->
	doc("When the method is CONNECT, authority-form must be used. This "
		"form does not apply to any other methods which must reject the "
		"request with a 400 status code and the closing of the connection. (RFC7230 5.3.3)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET localhost:80 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% @todo Implement CONNECT.
%authority_form_reject_userinfo(Config) ->
%An authority component with a userinfo component (and its
%"@" delimiter) is invalid. The request must be rejected with
%a 400 status code and the closing of the connection. (RFC7230 2.7.1)
%
%authority_form_limit_host(Config) ->
%authority_form_limit_port0(Config) ->
%authority_form_limit_port65536(Config) ->
%
%A request with a too long component of authority-form must be rejected with
%a 414 status code and the closing of the connection. (RFC7230 3.1.1)
%
%The authority is either resolved from configuration or is taken
%directly from authority-form. (RFC7230 5.5)
%
%authority_form_empty_path(Config) ->
%authority_form_empty_query(Config) ->
%The path and query are empty when using authority-form. (RFC7230 5.5)

%% Request-target: asterisk-form.

asterisk_form_reject_if_not_options(Config) ->
	doc("asterisk-form is used for server-wide OPTIONS requests. "
		"It is invalid with any other methods which must reject the "
		"request with a 400 status code and the closing of the connection. (RFC7230 5.3.4)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET * HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

asterisk_form_empty_path_query(Config) ->
	doc("The path and query components are empty when using asterisk-form. (RFC7230 5.5)"),
	#{code := 200, body := <<"http://localhost">>} = do_raw(Config,
		"OPTIONS * HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"X-Echo: uri\r\n"
		"\r\n").

%% Invalid request-target.

invalid_request_target(Config) ->
	doc("Any other form is invalid and must be rejected with a 400 status code "
		"and the closing of the connection."),
	#{code := 400, client := Client} = do_raw(Config,
		"GET \0 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

missing_request_target(Config) ->
	doc("The lack of request target must be rejected with a 400 status code "
		"and the closing of the connection."),
	#{code := 400, client := Client} = do_raw(Config,
		"GET  HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Between request-target and version.

reject_tab_between_request_target_and_version(Config) ->
	doc("A request that uses anything other than SP as separator between "
		"the request-target and the version must be rejected with a 400 "
		"status code and the closing of the connection. (RFC7230 3.1.1, RFC7230 3.5)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET /\tHTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_two_sp_between_request_target_and_version(Config) ->
	doc("A request that uses anything other than SP as separator between "
		"the request-target and the version must be rejected with a 400 "
		"status code and the closing of the connection. (RFC7230 3.1.1, RFC7230 3.5)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET /  HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Request version.

reject_invalid_version_http09(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. (RFC7230 2.6, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / HTTP/0.9\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_invalid_version_http100(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. (RFC7230 2.6, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / HTTP/1.00\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_invalid_version_http111(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. (RFC7230 2.6, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / HTTP/1.11\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_invalid_version_http12(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. (RFC7230 2.6, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / HTTP/1.2\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_invalid_version_http2(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. (RFC7230 2.6, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / HTTP/2\r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_empty_version(Config) ->
	doc("Any version number other than HTTP/1.0 or HTTP/1.1 must be "
		"rejected by a server or intermediary with a 505 status code. "
		"(RFC7230 2.6, RFC7230 A, RFC7230 A.2)"),
	#{code := 505} = do_raw(Config,
		"GET / \r\n"
		"Host: localhost\r\n"
		"\r\n").

reject_invalid_whitespace_after_version(Config) ->
	doc("A request that has whitespace different than CRLF following the "
		"version must be rejected with a 400 status code and the closing "
		"of the connection. (RFC7230 3.1.1)"),
	#{code := 400, client := Client} = do_raw(Config,
		"GET / HTTP/1.1 \r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{error, closed} = raw_recv(Client, 0, 1000).

%% Request headers.

invalid_header_name(Config) ->
	doc("Header field names are tokens. (RFC7230 3.2)"),
	#{code := 400} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host\0: localhost\r\n"
		"\r\n"]).

invalid_header_value(Config) ->
	doc("Header field values are made of printable characters, "
		"horizontal tab or space. (RFC7230 3.2)"),
	#{code := 400} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\0rm rf the world\r\n"
		"\r\n"]).

lower_case_header(Config) ->
	doc("The header field name is case insensitive. (RFC7230 3.2)"),
	#{code := 200} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"host: localhost\r\n"
		"\r\n"]).

upper_case_header(Config) ->
	doc("The header field name is case insensitive. (RFC7230 3.2)"),
	#{code := 200} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"HOST: localhost\r\n"
		"\r\n"]).

mixed_case_header(Config) ->
	doc("The header field name is case insensitive. (RFC7230 3.2)"),
	#{code := 200} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"hOsT: localhost\r\n"
		"\r\n"]).

reject_whitespace_before_header_name(Config) ->
	doc("Messages that contain whitespace before the header name must "
		"be rejected with a 400 status code and the closing of the "
		"connection. (RFC7230 3.2.4)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		" Host: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"\tHost: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000).

reject_whitespace_between_header_name_and_colon(Config) ->
	doc("Messages that contain whitespace between the header name and "
		"colon must be rejected with a 400 status code and the closing "
		"of the connection. (RFC7230 3.2.4)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host : localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host\t: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000).

reject_header_name_without_colon(Config) ->
	doc("Messages that contain a header name that is not followed by a "
		"colon must be rejected with a 400 status code and the closing "
		"of the connection. (RFC7230 3.2.4)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000),
	#{code := 400, client := Client3} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host\r\n"
		" : localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client3, 0, 1000).

limit_header_name(Config) ->
	doc("The header name must be subject to a configurable limit. A "
		"good default is 50 characters, well above the longest registered "
		"header. Such a request must be rejected with a 431 status code "
		"and the closing of the connection. "
		"(RFC7230 3.2.5, RFC6585 5, IANA Message Headers registry)"),
	#{code := 431, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n",
		binary:copy(<<$a>>, 32768), ": bad\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

limit_header_value(Config) ->
	doc("The header value and the optional whitespace around it must be "
		"subject to a configurable limit. There is no recommendations "
		"for the default. 4096 characters is known to work well. Such "
		"a request must be rejected with a 431 status code and the closing "
		"of the connection. (RFC7230 3.2.5, RFC6585 5)"),
	#{code := 431, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"bad: ", binary:copy(<<$a>>, 32768), "\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

drop_whitespace_before_header_value(Config) ->
	doc("Optional whitespace before and after the header value is not "
		"part of the value and must be dropped."),
	#{code := 200} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length:      \t     12\r\n"
		"\r\n"
		"Hello world!"]).

drop_whitespace_after_header_value(Config) ->
	doc("Optional whitespace before and after the header value is not "
		"part of the value and must be dropped."),
	#{code := 200} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12     \t     \r\n"
		"\r\n"
		"Hello world!"]).

reject_lf_line_breaks(Config) ->
	doc("A server may accept header names separated by a single LF, instead of "
		"CRLF. Cowboy rejects all requests that use LF as separator. (RFC7230 3.5)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%@todo
%The order of header fields with differing names is not significant. (RFC7230 3.2.2)
%
%@todo
%The normal procedure for parsing headers is to read each header
%field into a hash table by field name until the empty line. (RFC7230 3)

reject_duplicate_content_length_header(Config) ->
	doc("Requests with duplicate content-length headers must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 3.3.2)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12\r\n"
		"Content-length: 12\r\n"
		"\r\n"
		"Hello world!"]),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_duplicate_host_header(Config) ->
	doc("Requests with duplicate host headers must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 3.3.2)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Host: localhost\r\n"
		"\r\n"
		"Hello world!"]),
	{error, closed} = raw_recv(Client, 0, 1000).

combine_duplicate_headers(Config) ->
	doc("Other duplicate header fields must be combined by inserting a comma "
		"between the values in the order they were received. (RFC7230 3.2.2)"),
	#{code := 200, body := Body} = do_raw(Config, [
		"GET /echo/headers HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Accept-encoding: gzip\r\n"
		"Accept-encoding: brotli\r\n"
		"\r\n"]),
	<<"#{<<\"accept-encoding\">> => <<\"gzip, brotli\">>,", _/bits>> = Body,
	ok.

%Duplicate header field names are only allowed when their value is
%a comma-separated list. In practice there is no need to perform
%a check while reading the headers as the value will become invalid
%and the error can be handled while parsing the header later on. (RFC7230 3.2.2)
%
%wait_for_eoh_before_processing_request(Config) ->
%The request must not be processed until all headers have arrived. (RFC7230 3.2.2)

limit_headers(Config) ->
	doc("The number of headers allowed in a request must be subject to "
		"a configurable limit. There is no recommendations for the default. "
		"100 headers is known to work well. Such a request must be rejected "
		"with a 431 status code and the closing of the connection. (RFC7230 3.2.5, RFC6585 5)"),
	%% 100 headers.
	#{code := 200} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n",
		[["H-", integer_to_list(N), ": value\r\n"] || N <- lists:seq(1, 99)],
		"\r\n"]),
	%% 101 headers.
	#{code := 431, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n",
		[["H-", integer_to_list(N), ": value\r\n"] || N <- lists:seq(1, 100)],
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%ignore_header_empty_list_elements(Config) ->
%When parsing header field values, the server must ignore empty
%list elements, and not count those as the count of elements present. (RFC7230 7)
%
%@todo
%The information in the via header is largely unreliable. (RFC7230 5.7.1)

%% Request body.

%@todo
%The message body is the octets after decoding any transfer
%codings. (RFC7230 3.3)

no_request_body(Config) ->
	doc("A request has a message body only if it includes a transfer-encoding "
		"header or a non-zero content-length header. (RFC7230 3.3)"),
	#{code := 200, body := <<"false">>} = do_raw(Config, [
		"POST /echo/has_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	#{code := 200, body := <<>>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	ok.

no_request_body_content_length_zero(Config) ->
	doc("A request has a message body only if it includes a transfer-encoding "
		"header or a non-zero content-length header. (RFC7230 3.3)"),
	#{code := 200, body := <<"false">>} = do_raw(Config, [
		"POST /echo/has_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 0\r\n"
		"\r\n"]),
	#{code := 200, body := <<>>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 0\r\n"
		"\r\n"]),
	ok.

request_body_content_length(Config) ->
	doc("A request has a message body only if it includes a transfer-encoding "
		"header or a non-zero content-length header. (RFC7230 3.3)"),
	#{code := 200, body := <<"true">>} = do_raw(Config, [
		"POST /echo/has_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12\r\n"
		"\r\n"
		"Hello world!"]),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12\r\n"
		"\r\n"
		"Hello world!"]),
	ok.

request_body_transfer_encoding(Config) ->
	doc("A request has a message body only if it includes a transfer-encoding "
		"header or a non-zero content-length header. (RFC7230 3.3)"),
	#{code := 200, body := <<"true">>} = do_raw(Config, [
		"POST /echo/has_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

%```
%Transfer-Encoding = 1#transfer-coding
%
%transfer-coding = "chunked" / "compress" / "deflate" / "gzip" / transfer-extension
%transfer-extension = token *( OWS ";" OWS transfer-parameter )
%transfer-parameter = token BWS "=" BWS ( token / quoted-string )
%```

case_insensitive_transfer_encoding(Config) ->
	doc("The transfer-coding is case insensitive. (RFC7230 4)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: ChUnKeD\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

%@todo
%There are no known other transfer-extension with the exception of
%deprecated aliases "x-compress" and "x-gzip". (IANA HTTP Transfer Coding Registry,
%RFC7230 4.2.1, RFC7230 4.2.3, RFC7230 8.4.2)

%% This is the exact same test as request_body_transfer_encoding.
must_understand_chunked(Config) ->
	doc("A server must be able to handle at least chunked transfer-encoding. "
		"This is also the only coding that sees widespread use. (RFC7230 3.3.1, RFC7230 4.1)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

reject_double_chunked_encoding(Config) ->
	doc("Messages encoded more than once with chunked transfer-encoding "
		"must be rejected with a 400 status code and the closing of the "
		"connection. (RFC7230 3.3.1)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked, chunked\r\n"
		"\r\n"
		"20\r\n6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_non_terminal_chunked(Config) ->
	doc("Messages where chunked, when present, is not the last "
		"transfer-encoding must be rejected with a 400 status code "
		"and the closing of the connection. (RFC7230 3.3.3)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked, gzip\r\n"
		"\r\n",
		zlib:gzip(<<"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n">>)]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"Transfer-encoding: gzip\r\n"
		"\r\n",
		zlib:gzip(<<"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n">>)]),
	{error, closed} = raw_recv(Client2, 0, 1000).

%@todo
%Some non-conformant implementations send the "deflate" compressed
%data without the zlib wrapper. (RFC7230 4.2.2)

reject_unknown_transfer_encoding(Config) ->
	doc("Messages encoded with a transfer-encoding the server does not "
		"understand must be rejected with a 501 status code and the "
		"closing of the connection. (RFC7230 3.3.1)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: unknown, chunked\r\n"
		"\r\n",
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: unknown\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n",
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000).

%@todo
%A server may reject requests with a body and no content-length
%header with a 411 status code. (RFC7230 3.3.3)

%```
%Content-Length = 1*DIGIT
%```

reject_invalid_content_length(Config) ->
	doc("A request with an invalid content-length header must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 3.3.3)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12,12\r\n"
		"\r\n"
		"Hello world!"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: NaN\r\n"
		"\r\n"
		"Hello world!"]),
	{error, closed} = raw_recv(Client2, 0, 1000).

%@todo
%The content-length header ranges from 0 to infinity. Requests
%with a message body too large must be rejected with a 413 status
%code and the closing of the connection. (RFC7230 3.3.2)

ignore_content_length_when_transfer_encoding(Config) ->
	doc("When a message includes both transfer-encoding and content-length "
		"headers, the content-length header must be removed before processing "
		"the request. (RFC7230 3.3.3)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"Content-length: 12\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

%socket_error_while_reading_body(Config) ->
%If a socket error occurs while reading the body the server
%must send a 400 status code response and close the connection. (RFC7230 3.3.3, RFC7230 3.4)
%
%timeout_while_reading_body(Config) ->
%If a timeout occurs while reading the body the server must
%send a 408 status code response and close the connection. (RFC7230 3.3.3, RFC7230 3.4)

%% Body length.

body_length_chunked_before(Config) ->
	doc("The length of a message with a transfer-encoding header can "
		"only be determined on decoding completion. (RFC7230 3.3.3)"),
	#{code := 200, body := <<"undefined">>} = do_raw(Config, [
		"POST /echo/body_length HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

body_length_chunked_after(Config) ->
	doc("Upon completion of chunk decoding the server must add a content-length "
		"header with the value set to the total length of data read. (RFC7230 4.1.3)"),
	#{code := 200, body := <<"12">>} = do_raw(Config, [
		"POST /length/echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

body_length_content_length(Config) ->
	doc("The length of a message with a content-length header is "
		"the numeric value in octets found in the header. (RFC7230 3.3.3)"),
	#{code := 200, body := <<"12">>} = do_raw(Config, [
		"POST /echo/body_length HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Content-length: 12\r\n"
		"\r\n"
		"Hello world!"]),
	ok.

body_length_zero(Config) ->
	doc("A message with no transfer-encoding or content-length header "
		"has a body length of 0. (RFC7230 3.3.3)"),
	#{code := 200, body := <<"0">>} = do_raw(Config, [
		"POST /echo/body_length HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	ok.

%% Chunked transfer-encoding.

reject_invalid_chunk_size(Config) ->
	doc("A request with an invalid chunk size must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 4.1)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\nFIVE\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%```
%chunked-body = *chunk last-chunk trailer-part CRLF
%
%chunk = chunk-size [ chunk-ext ] CRLF chunk-data CRLF
%chunk-size = 1*HEXDIG
%chunk-data = 1*OCTET ; a sequence of chunk-size octets
%
%last-chunk = 1*("0") [ chunk-ext ] CRLF
%```
%
%The chunk-size field is a string of hex digits indicating the size of
%the chunk-data in octets.
%
%```
%chunk-ext = *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
%chunk-ext-name = token
%chunk-ext-val = token / quoted-string
%```

ignore_unknown_chunk_extensions(Config) ->
	doc("Unknown chunk extensions must be ignored. (RFC7230 4.1.1)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; hello=\"cool world\"\r\nHello \r\n"
		"5 ; one ; two ; three;four;five\r\nworld"
		"\r\n1;ok\r\n!\r\n0\r\n\r\n"]),
	ok.

%% Since we skip everything right now, the only reason
%% we might reject chunk extensions is if they are too large.
limit_chunk_size_line(Config) ->
	doc("A request with chunk extensions larger than the server allows must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 4.1.1)"),
	#{code := 200, body := <<"Hello world!">>} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; hello=\"cool world\"\r\nHello \r\n"
		"5;", lists:duplicate(128, $a), "\r\nworld"
		"\r\n1;ok\r\n!\r\n0\r\n\r\n"]),
	#{code := 400, client := Client} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; hello=\"cool world\"\r\nHello \r\n"
		"5;", lists:duplicate(129, $a), "\r\nworld"
		"\r\n1;ok\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_invalid_chunk_size_crlf(Config) ->
	doc("A request with an invalid line break after the chunk size must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 4.1)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\rHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000),
	#{code := 400, client := Client3} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6Hello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client3, 0, 1000).

reject_invalid_chunk_ext_crlf(Config) ->
	doc("A request with an invalid line break after chunk extensions must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 4.1)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; extensions\rHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; extensions\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000),
	#{code := 400, client := Client3} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6; extensionsHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client3, 0, 1000).

reject_invalid_chunk_data_crlf(Config) ->
	doc("A request with an invalid line break after the chunk data must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 4.1)"),
	#{code := 400, client := Client1} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client1, 0, 1000),
	#{code := 400, client := Client2} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client2, 0, 1000),
	#{code := 400, client := Client3} = do_raw(Config, [
		"POST /echo/read_body HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello 5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	{error, closed} = raw_recv(Client3, 0, 1000).

%```
%trailer-part = *( header-field CRLF )
%```
%
%%% @todo see headers above and reject the same way, space etc.
%reject_invalid_request_trailer(Config) ->
%
%ignore_request_trailer_transfer_encoding(Config) ->
%ignore_request_trailer_content_length(Config) ->
%ignore_request_trailer_host(Config) ->
%ignore_request_trailer_cache_control(Config) ->
%ignore_request_trailer_expect(Config) ->
%ignore_request_trailer_max_forwards(Config) ->
%ignore_request_trailer_pragma(Config) ->
%ignore_request_trailer_range(Config) ->
%ignore_request_trailer_te(Config) ->
%ignore_request_trailer_if_match(Config) ->
%ignore_request_trailer_if_none_match(Config) ->
%ignore_request_trailer_if_modified_since(Config) ->
%ignore_request_trailer_if_unmodified_since(Config) ->
%ignore_request_trailer_if_range(Config) ->
%ignore_request_trailer_www_authenticate(Config) ->
%ignore_request_trailer_authorization(Config) ->
%ignore_request_trailer_proxy_authenticate(Config) ->
%ignore_request_trailer_proxy_authorization(Config) ->
%ignore_request_trailer_content_encoding(Config) ->
%ignore_request_trailer_content_type(Config) ->
%ignore_request_trailer_content_range(Config) ->
%ignore_request_trailer_trailer(Config) ->
%
%ignore_response_trailer_header(Config, Header) ->
%Trailing headers must not include transfer-encoding, content-length,
%host, cache-control, expect, max-forwards, pragma, range, te,
%if-match, if-none-match, if-modified-since, if-unmodified-since,
%if-range, www-authenticate, authorization, proxy-authenticate,
%proxy-authorization, age, cache-control, expires, date, location,
%retry-after, vary, warning, content-encoding, content-type,
%content-range, or trailer. (RFC7230 4.1.2)
%
%When trailer headers are processed, invalid headers must be ignored.
%Valid headers must be added to the list of headers of the request. (RFC7230 4.1.2)
%
%ignore_request_trailers(Config) ->
%Trailer headers can be ignored safely. (RFC7230 4.1.2)
%
%limit_request_trailer_headers(Config) ->
%The number of trailer headers must be subject to configuration.
%There is no known recommendations for the default. A value of 10
%should cover most cases. Requests with too many trailer headers
%must be rejected with a 431 status code and the closing of the
%connection. (RFC6585 5)

%% We remove the header immediately so there's no need
%% to try to read the body before checking.
remove_transfer_encoding_chunked_after_body_read(Config) ->
	doc("Upon completion of chunk decoding the server must remove \"chunked\" "
		"from the transfer-encoding header. This header must be removed if "
		"it becomes empty following this removal. (RFC7230 4.1.3)"),
	#{code := 200, body := <<"undefined">>} = do_raw(Config, [
		"POST /echo/header/transfer-encoding HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Transfer-encoding: chunked\r\n"
		"\r\n"
		"6\r\nHello \r\n5\r\nworld\r\n1\r\n!\r\n0\r\n\r\n"]),
	ok.

%remove_trailer_after_body_read(Config) ->
%Upon completion of chunk decoding the server must remove the trailer
%header from the list of headers. (RFC7230 4.1.3)
%
%```
%Trailer = 1#field-name
%```
%
%ignore_chunked_headers_not_in_trailer(Config) ->
%The trailer header can be used to list the headers found in the
%trailer. A server must have the option of ignoring trailer headers
%that were not listed in the trailer header. (RFC7230 4.4)
%
%ignore_chunked_headers_if_trailer_not_in_connection(Config) ->
%The trailer header must be listed in the connection header field.
%Trailers must be ignored otherwise.
%
%%% @todo Though we need a compatibility mode as some clients don't send it...
%reject_chunked_missing_end_crlf(Config) ->
%@todo ending CRLF

%% Connection management.

%@todo can probably test using auth
%Never assume any two requests on a single connection come
%from the same user agent. (RFC7230 2.3)
%
%```
%Connection = 1#token ; case-insensitive
%```
%
%The connection token is either case insensitive "close", "keep-alive"
%or a header field name.
%
%There are no corresponding "close" or "keep-alive" headers. (RFC7230 8.1, RFC7230 A.2)
%
%The connection header is valid only for the immediate connection,
%alongside any header field it lists. (RFC7230 6.1)
%
%The server must determine if the connection is persistent for
%every message received by looking at the connection header and
%HTTP version. (RFC7230 6.3)

no_connection_header_keepalive(Config) ->
	doc("HTTP/1.1 requests with no \"close\" option "
		"indicate the connection will persist. (RFC7230 6.1, RFC7230 6.3)"),
	#{code := 200, headers := RespHeaders, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	false = lists:keyfind(<<"connection">>, 1, RespHeaders),
	{error, timeout} = raw_recv(Client, 0, 1000).

http10_connection_keepalive(Config) ->
	doc("HTTP/1.0 requests with the \"keep-alive\" option "
		"indicate the connection will persist. "
		"(RFC7230 6.1, RFC7230 6.3, RFC7230 A.1.2)"),
	#{code := 200, headers := RespHeaders, client := Client} = do_raw(Config, [
		"GET / HTTP/1.0\r\n"
		"Host: localhost\r\n"
		"Connection: keep-alive\r\n"
		"\r\n"]),
	{_, <<"keep-alive">>} = lists:keyfind(<<"connection">>, 1, RespHeaders),
	{error, timeout} = raw_recv(Client, 0, 1000).

connection_close(Config) ->
	doc("HTTP/1.1 requests with the \"close\" option and HTTP/1.0 with no "
		"\"keep-alive\" option indicate the connection will be closed "
		"upon reception of the response by the client. (RFC7230 6.1, RFC7230 6.3)"),
	#{code := 200, headers := RespHeaders, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Connection: close\r\n"
		"\r\n"]),
	{_, <<"close">>} = lists:keyfind(<<"connection">>, 1, RespHeaders),
	{error, closed} = raw_recv(Client, 0, 1000).

http10_no_connection_header_close(Config) ->
	doc("HTTP/1.0 with no \"keep-alive\" option indicate "
		"the connection will be closed upon reception of "
		"the response by the client. (RFC7230 6.1, RFC7230 6.3, RFC7230 A.1.2)"),
	#{code := 200, headers := RespHeaders, client := Client} = do_raw(Config, [
		"GET / HTTP/1.0\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	%% Cowboy always sends a close header back to HTTP/1.0 clients
	%% that support keep-alive, even though it is not required.
	{_, <<"close">>} = lists:keyfind(<<"connection">>, 1, RespHeaders),
	{error, closed} = raw_recv(Client, 0, 1000).

limit_requests_keepalive(Config) ->
	doc("The maximum number of requests sent using a persistent connection "
		"must be subject to configuration. The connection must be closed "
		"when the limit is reached. (RFC7230 6.3)"),
	ConnPid = gun_open(Config),
	_ = [begin
		Ref = gun:get(ConnPid, "/"),
		{response, nofin, 200, RespHeaders} = gun:await(ConnPid, Ref),
		{ok, <<"Hello world!">>} = gun:await_body(ConnPid, Ref),
		false = lists:keyfind(<<"connection">>, 1, RespHeaders)
	end || _ <- lists:seq(1,99)],
	%% Final request closes the connection.
	Ref = gun:get(ConnPid, "/"),
	{response, nofin, 200, RespHeaders} = gun:await(ConnPid, Ref),
	{ok, <<"Hello world!">>} = gun:await_body(ConnPid, Ref),
	{_, <<"close">>} = lists:keyfind(<<"connection">>, 1, RespHeaders),
	gun_down(ConnPid).

accept_at_least_1_empty_line_keepalive(Config) ->
	doc("A configurable number of empty lines (CRLF) preceding the request "
		"must be ignored. At least 1 empty line must be ignored. (RFC7230 3.5)"),
	#{code := 200, client := Client} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"
		%% We send an extra CRLF that must be ignored.
		"\r\n"),
	ok = raw_send(Client,
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"),
	{'HTTP/1.1', 200, _, _} = cow_http:parse_status_line(raw_recv_head(Client)),
	ok.

%skip_request_body_by_closing_connection(Config) ->
%%A server that doesn't want to read the entire body of a message
%%must close the connection, if possible after sending the "close"
%%connection option in the response. (RFC7230 6.3)

pipeline(Config) ->
	doc("A server can receive more than one request before any response "
		"is sent. This is called pipelining. Responses must be sent "
		"in the same order as the requests. (RFC7230 6.3.2)"),
	ConnPid = gun_open(Config),
	Refs = [{
		gun:get(ConnPid, "/"),
		gun:post(ConnPid, "/full/read_body", [], <<0:80000>>)
	} || _ <- lists:seq(1, 25)],
	_ = [begin
		{response, nofin, 200, _} = gun:await(ConnPid, Ref1, infinity),
		{ok, <<"Hello world!">>} = gun:await_body(ConnPid, Ref1, infinity),
		{response, nofin, 200, _} = gun:await(ConnPid, Ref2, infinity),
		{ok, <<0:80000>>} = gun:await_body(ConnPid, Ref2, infinity)
	end || {Ref1, Ref2} <- Refs],
	ok.

%% @todo pipeline_parallel (safe methods can, others can't)
%The requests can be processed in parallel if they all have safe methods.

%@todo
%A server that does parallel pipelining must send responses in the
%same order as the requests came in. (RFC7230 5.6)

%@todo
%The server must reject abusive traffic by closing the connection.
%Abusive traffic can come from the form of too many requests in a
%given amount of time, or too many concurrent connections. Limits
%must be subject to configuration. (RFC7230 6.4)

close_inactive_connections(Config) ->
	doc("The server must close inactive connections. The timeout "
		"must be subject to configuration. (RFC7230 6.5)"),
	Client = raw_open(Config),
	{error, closed} = raw_recv(Client, 0, 6000).

%@todo
%The server must monitor connections for the close signal
%and close the socket on its end accordingly. (RFC7230 6.5)
%
%@todo
%A connection close may occur at any time. (RFC7230 6.5)

ignore_requests_after_request_connection_close(Config) ->
	doc("The server must not process any request after "
		"receiving the \"close\" connection option. (RFC7230 6.6)"),
	Self = self(),
	#{code := 200, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Connection: close\r\n"
		"\r\n"
		"GET /send_message HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"x-test-pid: ", pid_to_list(Self), "\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000),
	%% We receive a message if the second request is wrongly processed.
	receive
		{Self, _, init, Req, Opts} ->
			error({init, Req, Opts})
	after 1000 ->
		ok
	end.

ignore_requests_after_response_connection_close(Config) ->
	doc("The server must not process any request after "
		"sending the \"close\" connection option. (RFC7230 6.6)"),
	Self = self(),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		[
			"GET / HTTP/1.1\r\n"
			"Host: localhost\r\n"
			"\r\n"
		|| _ <- lists:seq(1, 100)],
		"GET /send_message HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"x-test-pid: ", pid_to_list(Self), "\r\n"
		"\r\n"]),
	%% We have a separate test for the connection close so we don't
	%% double check the connection gets closed here. We only need to
	%% know whether the 101st request was wrongly processed.
	receive
		{Self, _, init, Req, Opts} ->
			error({init, Req, Opts})
	after 1000 ->
		ok
	end.

%@todo
%The server must close the connection in stages to avoid the
%TCP reset problem. The server starts by closing the write
%side of the socket. The server then reads until it detects
%the socket has been closed, until it can be certain its
%last response has been received by the client, or until
%a close or timeout occurs. The server then fully close the
%connection. (6.6)

%% Routing.

%```
%Host = authority ; same as authority-form
%```

reject_missing_host(Config) ->
	doc("An HTTP/1.1 request that lacks a host header must be rejected with "
		"a 400 status code and the closing of the connection. (RFC7230 5.4)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

http10_allow_missing_host(Config0) ->
	doc("An HTTP/1.0 request that lacks a host header may be accepted. "
		"(RFC7230 5.4, RFC7230 5.5, RFC7230 A.1.1)"),
	Routes = [{'_', [{"/echo/:key[/:arg]", echo_h, []}]}],
	Config = cowboy_test:init_http(?FUNCTION_NAME, #{
		env => #{dispatch => cowboy_router:compile(Routes)}
	}, Config0),
	try
		#{code := 200, body := <<>>} = do_raw(Config, [
			"GET /echo/host HTTP/1.0\r\n"
			"\r\n"])
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

reject_invalid_host(Config) ->
	doc("A request with an invalid host header must be rejected with a "
		"400 status code and the closing of the connection. (RFC7230 5.4)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost:port\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_userinfo(Config) ->
	doc("An authority component with a userinfo component (and its "
		"\"@\" delimiter) is invalid. The request must be rejected with "
		"a 400 status code and the closing of the connection. (RFC7230 2.7.1)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: [email protected]\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

reject_absolute_form_different_host(Config) ->
	doc("When using absolute-form the URI authority component must be "
		"identical to the host header. Invalid requests must be rejected "
		"with a 400 status code and the closing of the connection. (RFC7230 5.4)"),
	#{code := 400, client := Client} = do_raw(Config, [
		"GET http://example.org/ HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{error, closed} = raw_recv(Client, 0, 1000).

%reject_authority_form_different_host(Config) ->
%When using authority-form the URI authority component must be
%identical to the host header. Invalid requests must be rejected
%with a 400 status code and the closing of the connection.

empty_host(Config0) ->
	doc("The host header is empty when the authority component is undefined. (RFC7230 5.4)"),
	Routes = [{'_', [{"/echo/:key[/:arg]", echo_h, []}]}],
	Config = cowboy_test:init_http(?FUNCTION_NAME, #{
		env => #{dispatch => cowboy_router:compile(Routes)}
	}, Config0),
	try
		#{code := 200, body := <<>>} = do_raw(Config, [
			"GET /echo/host HTTP/1.1\r\n"
			"Host:\r\n"
			"\r\n"]),
		#{code := 200, body := <<>>} = do_raw(Config, [
			"GET /echo/host HTTP/1.1\r\n"
			"Host: \r\n"
			"\r\n"])
	after
		cowboy:stop_listener(?FUNCTION_NAME)
	end.

%% The effective request URI can be rebuilt by concatenating scheme,
%% "://", authority, path and query components. (RFC7230 5.5)
%%
%% This is covered in req_SUITE in the tests for cowboy_req:uri/1,2.

reject_non_authoritative_host(Config) ->
	doc("A request with a host header for which the origin server is "
		"not authoritative must be rejected with a 400 status code. "
		"(RFC7230 5.5, RFC7230 9.1)"),
	#{code := 400} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: ninenines.eu\r\n"
		"\r\n"]),
	ok.

%@todo
%Resources with identical URI except for the scheme component
%must be treated as different. (RFC7230 2.7.2)

%% Response.

%@todo
%A server can send more than one response per request only when a
%1xx response is sent preceding the final response. (RFC7230 5.6)
%
%```
%HTTP-response = status-line *( header-field CRLF ) CRLF [ message-body ]
%```
%
%@todo
%The response format must be followed strictly.
%
%```
%status-line   = HTTP-version SP status-code SP reason-phrase CRLF
%status-code   = 3DIGIT
%reason-phrase = *( HTAB / SP / VCHAR / obs-text )
%```

http10_request_http11_response(Config) ->
	doc("A server must send its own HTTP version in responses. (RFC7230 2.6)"),
	#{code := 200, version := 'HTTP/1.1'} = do_raw(Config, [
		"GET / HTTP/1.0\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	ok.

%@todo
%An HTTP/1.1 server may send an HTTP/1.0 version for compatibility purposes. (RFC7230 2.6)
%
%@todo
%RFC6585 defines additional status code a server can use to reject
%messages. (RFC7230 9.3, RFC6585)

%% Response headers.

%@todo
%In responses, OWS must be generated as SP or not generated
%at all. RWS must be generated as SP. BWS must not be
%generated. (RFC7230 3.2.3)
%
%```
%header-field = field-name ":" SP field-value
%
%field-name = token ; case-insensitive
%field-value = *( SP / %21-7E / %80-FF )
%```
%
%@todo
%In quoted-string found in field-value, quoted-pair must only be
%used for DQUOTE and backslash. (RFC7230 3.2.6)
%
%@todo
%HTTP header values must use US-ASCII encoding and must only send
%printable characters or SP. (RFC7230 3.2.4, RFC7230 9.4)
%
%@todo
%The server must not generate empty list elements in headers. (RFC7230 7)
%
%@todo
%When encoding an URI as part of a response, only characters that
%are reserved need to be percent-encoded. (RFC7230 2.7.3)

special_set_cookie_handling(Config) ->
	doc("The set-cookie header must be handled as a special case. There "
		"must be exactly one set-cookie header field per cookie. (RFC7230 3.2.2)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/set_resp_cookie3/multiple HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	[_, _] = [H || H={<<"set-cookie">>, _} <- RespHeaders],
	ok.

%@todo
%The server must list headers for or about the immediate connection
%in the connection header field. (RFC7230 6.1)
%
%@todo
%A server that does not support persistent connections must
%send "close" in every non-1xx response. (RFC7230 6.1)
%
%no_close_in_100_response(Config) ->
%no_close_in_101_response(Config) ->
%no_close_in_102_response(Config) ->
%A server must not send a "close" connection option
%in 1xx responses. (RFC7230 6.1)
%
%@todo
%The "close" connection must be sent in a message when the
%sender knows it will close the connection after fully sending
%the response. (RFC7230 6.6)
%
%@todo
%A server must close the connection after sending or
%receiving a "close" once the response has been sent. (RFC7230 6.6)

close_request_close_response(Config) ->
	doc("A server must send a \"close\" in a response to a request "
		"containing a \"close\". (RFC7230 6.6)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Connection: close\r\n"
		"\r\n"]),
	{_, <<"close">>} = lists:keyfind(<<"connection">>, 1, RespHeaders),
	ok.

%% Response body.

no_body_in_head_response(Config) ->
	doc("Responses to HEAD requests never include a message body. (RFC7230 3.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"HEAD / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 200, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	{_, LengthBin} = lists:keyfind(<<"content-length">>, 1, Headers),
	Length = binary_to_integer(LengthBin),
	{error, timeout} = raw_recv(Client, Length, 1000),
	ok.

%% @todo test different ways to send a body in response

%%% @todo Implement CONNECT
%2xx responses to CONNECT requests never include a message
%body. (RFC7230 3.3)
%
%no_body_in_100_response(Config) ->
%no_body_in_101_response(Config) ->
%no_body_in_102_response(Config) ->
%1xx responses never include a message body. (RFC7230 3.3)

no_body_in_204_response(Config) ->
	doc("204 responses never include a message body. (RFC7230 3.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/reply2/204 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 204, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{_, <<>>} = cow_http:parse_headers(Rest),
	{error, timeout} = raw_recv(Client, 1, 1000),
	ok.

no_body_in_204_response_stream(Config) ->
	doc("204 responses never include a message body. (RFC7230 3.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/stream_reply2/204 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 204, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{_, <<>>} = cow_http:parse_headers(Rest),
	{error, timeout} = raw_recv(Client, 1, 1000),
	ok.

no_body_in_304_response(Config) ->
	doc("304 responses never include a message body. (RFC7230 3.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/reply2/304 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 304, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{_, <<>>} = cow_http:parse_headers(Rest),
	{error, timeout} = raw_recv(Client, 1, 1000),
	ok.

no_body_in_304_response_stream(Config) ->
	doc("304 responses never include a message body. (RFC7230 3.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/stream_reply2/304 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 304, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{_, <<>>} = cow_http:parse_headers(Rest),
	{error, timeout} = raw_recv(Client, 1, 1000),
	ok.

same_content_length_as_get_in_head_response(Config) ->
	doc("Responses to HEAD requests can include a content-length header. "
		"Its value must be the same as if the request was an unconditional "
		"GET. (RFC7230 3.3, RFC7230 3.3.1, RFC7230 3.3.2)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"HEAD / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 200, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	{_, <<"12">>} = lists:keyfind(<<"content-length">>, 1, Headers),
	ok.

same_transfer_encoding_as_get_in_head_response(Config) ->
	doc("Responses to HEAD requests can include a transfer-encoding header. "
		"Its value must be the same as if the request was an unconditional "
		"GET. (RFC7230 3.3, RFC7230 3.3.1, RFC7230 3.3.2)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"HEAD /resp/stream_reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 200, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, Headers),
	ok.

%same_content_length_as_200_in_304_response(Config) ->
%same_transfer_encoding_as_200_in_304_response(Config) ->
%304 responses can include a
%content-length or transfer-encoding header. Their value must
%be the same as if the request was an unconditional GET. (RFC7230 3.3, RFC7230 3.3.1, RFC7230 3.3.2)
%
%no_content_length_in_100_response(Config) ->
%no_content_length_in_101_response(Config) ->
%no_content_length_in_102_response(Config) ->
%1xx, 204 responses and "2xx responses to CONNECT requests" must
%not include a content-length or transfer-encoding header. (RFC7230 3.3.1, RFC7230 3.3.2)

no_content_length_in_204_response(Config) ->
	doc("204 responses must not include a content-length header. "
		"(RFC7230 3.3.1, RFC7230 3.3.2)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/reply3/204 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 204, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	false = lists:keyfind(<<"content-length">>, 1, Headers),
	ok.

no_content_length_in_empty_304_response(Config) ->
	doc("304 responses should not include a content-length header, "
		"unless it matches the resource's and was therefore set "
		"explicitly by the user. (RFC7230 3.3.1, RFC7230 3.3.2)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/reply3/304 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 304, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	false = lists:keyfind(<<"content-length">>, 1, Headers),
	ok.

%%% @todo CONNECT no_content_length_in_2xx_response_to_connect_request(Config) ->
%no_transfer_encoding_in_100_response(Config) ->
%no_transfer_encoding_in_101_response(Config) ->
%no_transfer_encoding_in_102_response(Config) ->
%1xx, 204 responses and "2xx responses to CONNECT requests" must
%not include a content-length or transfer-encoding header. (RFC7230 3.3.1, RFC7230 3.3.2)

%% We only send transfer-encoding when streaming a response body.
%% We therefore need a streamed response in order to see a potential bug.
no_transfer_encoding_in_204_response(Config) ->
	doc("204 responses must not include a transfer-encoding header. "
		"(RFC7230 3.3.1, RFC7230 3.3.2)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/stream_reply2/204 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 204, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{Headers, <<>>} = cow_http:parse_headers(Rest),
	false = lists:keyfind(<<"transfer-encoding">>, 1, Headers),
	ok.

%%% @todo CONNECT no_transfer_encoding_in_2xx_response_to_connect_request(Config) ->
%1xx, 204 responses and "2xx responses to CONNECT requests" must
%not include a content-length or transfer-encoding header. (RFC7230 3.3.1, RFC7230 3.3.2)
%
%```
%message-body = *OCTET
%```
%
%The message body is the octets after decoding any transfer
%codings. (RFC7230 3.3)

content_length_0_when_no_body(Config) ->
	doc("When the length is known in advance, the server must send a "
		"content-length header, including if the length is 0. (RFC7230 3.3.2, RFC7230 3.3.3)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, <<"0">>} = lists:keyfind(<<"content-length">>, 1, RespHeaders),
	ok.

content_length_response(Config) ->
	doc("When the length is known in advance, the server must send a "
		"content-length header. (RFC7230 3.3.2, RFC7230 3.3.3)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, <<"12">>} = lists:keyfind(<<"content-length">>, 1, RespHeaders),
	ok.

chunked_response(Config) ->
	doc("When the length is not known in advance, the chunked transfer-encoding "
		"must be used. (RFC7230 3.3.2, RFC7230 3.3.3)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	%% @todo We probably want to check the body received too.
	ok.

%compat_no_content_length_or_transfer_encoding_close_on_body_end(Config) ->
%For compatibility purposes a server can send no content-length or
%transfer-encoding header. In this case the connection must be
%closed after the response has been sent fully. (RFC7230 3.3.2, RFC7230 3.3.3)

no_content_length_if_transfer_encoding(Config) ->
	doc("The content-length header must not be sent when a transfer-encoding "
		"header already exists. (RFC7230 3.3.2)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	false = lists:keyfind(<<"content-length">>, 1, RespHeaders),
	ok.

%@todo
%The server must not apply the chunked transfer-encoding more than
%once. (RFC7230 3.3.1)
%
%@todo
%The server must apply the chunked transfer-encoding last. (RFC7230 3.3.1)

http10_request_no_transfer_encoding_in_response(Config) ->
	doc("The transfer-encoding header must not be sent in responses to "
		"HTTP/1.0 requests, or in responses that use the HTTP/1.0 version. "
		"No transfer codings must be applied in these cases. "
		"(RFC7230 3.3.1, RFC7230 A.1.3)"),
	Client = raw_open(Config),
	ok = raw_send(Client, [
		"GET /resp/stream_reply2/200 HTTP/1.0\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, 200, _, Rest} = cow_http:parse_status_line(raw_recv_head(Client)),
	{RespHeaders, Body0} = cow_http:parse_headers(Rest),
	false = lists:keyfind(<<"content-length">>, 1, RespHeaders),
	false = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	Body = <<0:8000000>>,
	{ok, Body1} = raw_recv(Client, byte_size(Body) - byte_size(Body0), 5000),
	Body = << Body0/binary, Body1/binary >>,
	%% The end of body is indicated by a connection close.
	{error, closed} = raw_recv(Client, 0, 1000),
	ok.

no_te_no_trailers(Config) ->
	doc("Trailers can only be sent if the request includes a TE header "
		"containing \"trailers\". (RFC7230 4.1.2)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_trailers HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"\r\n"]),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	false = lists:keyfind(<<"trailer">>, 1, RespHeaders),
	%% @todo We probably want to check the body received too.
	ok.

te_trailers(Config) ->
	doc("Trailers can only be sent if the request includes a TE header "
		"containing \"trailers\". (RFC7230 4.1.2)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_trailers HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"TE: trailers\r\n"
		"\r\n"]),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	{_, <<"grpc-status">>} = lists:keyfind(<<"trailer">>, 1, RespHeaders),
	%% @todo We probably want to check the body received too.
	ok.

te_ignore_chunked(Config) ->
	doc("The presence of \"chunked\" in a TE header must be ignored as it "
		"is always acceptable with HTTP/1.1. (RFC7230 4.3)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"TE: chunked\r\n"
		"\r\n"]),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	%% @todo We probably want to check the body received too.
	ok.

te_ignore_chunked_0(Config) ->
	doc("The presence of \"chunked\" in a TE header must be ignored as it "
		"is always acceptable with HTTP/1.1. (RFC7230 4.3)"),
	#{code := 200, headers := RespHeaders} = do_raw(Config, [
		"GET /resp/stream_reply2/200 HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"TE: chunked;q=0\r\n"
		"\r\n"]),
	{_, <<"chunked">>} = lists:keyfind(<<"transfer-encoding">>, 1, RespHeaders),
	%% @todo We probably want to check the body received too.
	ok.

%%% @todo te_not_acceptable_coding(Config) ->
%A qvalue of 0 in the TE header means "not acceptable". (RFC7230 4.3)
%
%@todo
%The lack of a TE header or an empty TE header means only "chunked"
%(with no trailers) or no transfer-encoding is acceptable. (RFC7230 4.3)
%
%@todo
%Trailer headers must be listed in the trailer header field value. (RFC7230 4.4)

%% Upgrade.

%```
%Upgrade = 1#protocol
%
%protocol = protocol-name ["/" protocol-version]
%protocol-name = token
%protocol-version = token
%```
%
%The upgrade header contains the list of protocols the
%client wishes to upgrade to, in order of preference. (RFC7230 6.7)

upgrade_safely_ignored(Config) ->
	doc("The upgrade header can be safely ignored. (RFC7230 6.7)"),
	#{code := 200} = do_raw(Config,
		"GET / HTTP/1.1\r\n"
		"Host: localhost\r\n"
		"Connection: upgrade\r\n"
		"Upgrade: websocket\r\n"
		"\r\n").

%upgrade_must_be_in_connection_header(Config) ->
%The upgrade header must be listed under the connection header,
%or must be ignored otherwise. (RFC7230 6.7)
%
%@todo
%A server accepting an upgrade request must send a 101 status
%code with a upgrade header listing the protocol(s) it upgrades
%to, in layer-ascending order. In addition the upgrade header
%must be listed in the connection header. (RFC7230 6.7)
%
%%A server must not switch to a protocol not listed in the
%%request's upgrade header. (RFC7230 6.7)
%
%@todo
%A server that sends a 426 status code must include a upgrade
%header listing acceptable protocols in order of preference. (RFC7230 6.7)
%
%@todo
%A server can send a upgrade header to any response to advertise
%its support for other protocols listed in order of preference. (RFC7230 6.7)
%
%@todo
%Immediately after a server responds with a 101 status code
%it must respond to the original request using the new protocol. (RFC7230 6.7)
%
%@todo
%%A server must not switch protocols unless the original message's
%%semantics can be honored by the new protocol. OPTIONS requests
%%can be honored by any protocol. (RFC7230 6.7)
%
%http10_ignore_upgrade_header(Config) ->
%A server must ignore an upgrade header received by an HTTP/1.0
%request. (RFC7230 6.7)
%
%expect_then_upgrade(Config) ->
%A server receiving both an upgrade header and an expect header
%containing "100-continue" must send a 100 response before the
%101 response. (RFC7230 6.7)
%
%The upgrade header field cannot be used for switching the
%connection protocol (e.g. TCP) or switching connections. (RFC7230 6.7)

%% Compatibility.

%@todo
%A server can choose to be non-conformant to the specifications
%for the sake of compatibility. Such behavior can be enabled
%through configuration and/or software identification. (RFC7230 2.5)