aboutsummaryrefslogblamecommitdiffstats
path: root/lib/kernel/test/gen_tcp_echo_SUITE.erl
blob: 830e2d9c396dbed1ba50aa6a52ac3c01f3ed2d45 (plain) (tree)
1
2
3
4
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


                   
                                                        















                                                                         
                                                    


                       


                                                                    







                                                                            
                                         
 
         



                                                            



            





                         
                                     
           

                                    
           
 



                                                       
                                  





























































































































































































































































































































































































































































































































































                                                                                                        
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1997-2010. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%
-module(gen_tcp_echo_SUITE).

-include_lib("test_server/include/test_server.hrl").

%%-compile(export_all).

-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1, 
	 init_per_group/2,end_per_group/2, 
	 init_per_testcase/2, end_per_testcase/2,
	 active_echo/1, passive_echo/1, active_once_echo/1,
	 slow_active_echo/1, slow_passive_echo/1,
	 limit_active_echo/1, limit_passive_echo/1,
	 large_limit_active_echo/1, large_limit_passive_echo/1]).

-define(TPKT_VRSN, 3).
-define(LINE_LENGTH, 1023). % (default value of gen_tcp option 'recbuf') - 1

suite() -> [{ct_hooks,[ts_install_cth]}].

all() -> 
    [active_echo, passive_echo, active_once_echo,
     slow_active_echo, slow_passive_echo, limit_active_echo,
     limit_passive_echo, large_limit_active_echo,
     large_limit_passive_echo].

groups() -> 
    [].

init_per_suite(Config) ->
    Config.

end_per_suite(_Config) ->
    ok.

init_per_group(_GroupName, Config) ->
    Config.

end_per_group(_GroupName, Config) ->
    Config.


init_per_testcase(_Func, Config) ->
    Dog = test_server:timetrap(test_server:minutes(5)),
    [{watchdog, Dog}|Config].
end_per_testcase(_Func, Config) ->
    Dog = ?config(watchdog, Config),
    test_server:timetrap_cancel(Dog).

active_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in active mode)."];
active_echo(suite) -> [];
active_echo(Config) when is_list(Config) ->
    ?line echo_test([], fun active_echo/4, [{echo, fun echo_server/0}]).

passive_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in passive mode)."];
passive_echo(suite) -> [];
passive_echo(Config) when is_list(Config) ->
    ?line echo_test([{active, false}], fun passive_echo/4,
		    [{echo, fun echo_server/0}]).

active_once_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in active once mode)."];
active_once_echo(suite) -> [];
active_once_echo(Config) when is_list(Config) ->
    ?line echo_test([{active, once}], fun active_once_echo/4,
		    [{echo, fun echo_server/0}]).

slow_active_echo(doc) ->
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in active mode). ",
     "The echo server is a special one that delays between every character."];
slow_active_echo(suite) -> [];
slow_active_echo(Config) when is_list(Config) ->
    ?line echo_test([], fun active_echo/4, 
		    [slow_echo, {echo, fun slow_echo_server/0}]).

slow_passive_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to an echo server and receiving them again (socket in passive mode).",
     "The echo server is a special one that delays between every character."];
slow_passive_echo(suite) -> [];
slow_passive_echo(Config) when is_list(Config) ->
    ?line echo_test([{active, false}], fun passive_echo/4,
		    [slow_echo, {echo, fun slow_echo_server/0}]).

limit_active_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in active mode) "
     "with packet_size limitation."];
limit_active_echo(suite) -> [];
limit_active_echo(Config) when is_list(Config) ->
    ?line echo_test([{packet_size, 10}], 
		    fun active_echo/4, 
		    [{packet_size, 10}, {echo, fun echo_server/0}]).

limit_passive_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in passive mode) ",
     "with packet_size limitation."];
limit_passive_echo(suite) -> [];
limit_passive_echo(Config) when is_list(Config) ->
    ?line echo_test([{packet_size, 10},{active, false}], 
		    fun passive_echo/4,
		    [{packet_size, 10}, {echo, fun echo_server/0}]).

large_limit_active_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in active mode) "
     "with large packet_size limitation."];
large_limit_active_echo(suite) -> [];
large_limit_active_echo(Config) when is_list(Config) ->
    ?line echo_test([{packet_size, 10}], 
		    fun active_echo/4, 
		    [{packet_size, (1 bsl 32)-1}, 
		     {echo, fun echo_server/0}]).

large_limit_passive_echo(doc) -> 
    ["Test sending packets of various sizes and various packet types ",
     "to the echo port and receiving them again (socket in passive mode) ",
     "with large packet_size limitation."];
large_limit_passive_echo(suite) -> [];
large_limit_passive_echo(Config) when is_list(Config) ->
    ?line echo_test([{packet_size, 10},{active, false}], 
		    fun passive_echo/4,
		    [{packet_size, (1 bsl 32) -1}, 
		     {echo, fun echo_server/0}]).

echo_test(SockOpts, EchoFun, Config0) ->
    echo_test_1(SockOpts, EchoFun, Config0),
    io:format("\nrepeating test with {delay_send,true}"),
    echo_test_1([{delay_send,true}|SockOpts], EchoFun, Config0).

echo_test_1(SockOpts, EchoFun, Config0) ->
    ?line EchoSrvFun = ?config(echo, Config0),
    ?line {ok, EchoPort} = EchoSrvFun(),
    ?line Config = [{echo_port, EchoPort}|Config0],
    
    ?line echo_packet([{packet, 1}|SockOpts], EchoFun, Config),
    ?line echo_packet([{packet, 2}|SockOpts], EchoFun, Config),
    ?line echo_packet([{packet, 4}|SockOpts], EchoFun, Config),
    ?line echo_packet([{packet, sunrm}|SockOpts], EchoFun, Config),
    ?line echo_packet([{packet, cdr}|SockOpts], EchoFun,
		      [{type, {cdr, big}}|Config]),
    ?line echo_packet([{packet, cdr}|SockOpts], EchoFun,
		      [{type, {cdr, little}}|Config]),
    ?line case lists:keymember(packet_size, 1, SockOpts) of
	      false ->
		  ?line echo_packet([{packet, line}|SockOpts],
				    EchoFun, Config);
	      true -> ok
	  end,
    ?line echo_packet([{packet, tpkt}|SockOpts], EchoFun, Config),
    
    ?line ShortTag = [16#E0],
    ?line LongTag = [16#1F, 16#83, 16#27],
    ?line echo_packet([{packet, asn1}|SockOpts], EchoFun,
		      [{type, {asn1, short, ShortTag}}|Config]),
    ?line echo_packet([{packet, asn1}|SockOpts], EchoFun,
		      [{type, {asn1, long, ShortTag}}|Config]),
    ?line echo_packet([{packet, asn1}|SockOpts], EchoFun,
		      [{type, {asn1, short, LongTag}}|Config]),
    ?line echo_packet([{packet, asn1}|SockOpts], EchoFun,
		      [{type, {asn1, long, LongTag}}|Config]),

    ?line echo_packet([{packet, http}|SockOpts], EchoFun, Config),
    ?line echo_packet([{packet, http_bin}|SockOpts], EchoFun, Config),
    ok.

echo_packet(SockOpts, EchoFun, Opts) ->
    ?line Type =
	case lists:keysearch(type, 1, Opts) of
	    {value, {type, T}} ->
		T;
	    _ ->
		{value, {packet, T}} = lists:keysearch(packet, 1, SockOpts),
		T
	end,

    %% Connect to the echo server.
    ?line EchoPort = ?config(echo_port, Opts),
    ?line {ok, Echo} = gen_tcp:connect(localhost, EchoPort, SockOpts),

    ?line SlowEcho = 
	case os:type() of
	    vxworks -> true;
	    _ -> lists:member(slow_echo, Opts)
	end,

    case Type of
	http ->
	    echo_packet_http(Echo, Type, EchoFun);
	http_bin ->
	    echo_packet_http(Echo, Type, EchoFun);
	_ ->
	    echo_packet0(Echo, Type, EchoFun, SlowEcho, Opts)
    end.

echo_packet_http(Echo, Type, EchoFun) ->
    lists:foreach(fun(Uri)-> P1 = http_request(Uri),
			     EchoFun(Echo, Type, P1, http_reply(P1, Type))
		  end,
		  http_uri_variants()),
    P2 = http_response(),
    EchoFun(Echo, Type, P2, http_reply(P2, Type)).

echo_packet0(Echo, Type, EchoFun, SlowEcho, Opts) ->
    ?line PacketSize =
	case lists:keysearch(packet_size, 1, Opts) of
	    {value,{packet_size,Sz}} when Sz < 10 -> Sz;
	    {value,{packet_size,_}} -> 10;
	    false -> 0
	end,
    %% Echo small packets first.
    ?line echo_packet1(Echo, Type, EchoFun, 0),
    ?line echo_packet1(Echo, Type, EchoFun, 1),
    ?line echo_packet1(Echo, Type, EchoFun, 2),
    ?line echo_packet1(Echo, Type, EchoFun, 3),
    ?line echo_packet1(Echo, Type, EchoFun, 4),
    ?line echo_packet1(Echo, Type, EchoFun, 7),
    if PacketSize =/= 0 ->
	    ?line echo_packet1(Echo, Type, EchoFun, 
			       {PacketSize-1, PacketSize}),
	    ?line echo_packet1(Echo, Type, EchoFun, 
			       {PacketSize, PacketSize}),
	    ?line echo_packet1(Echo, Type, EchoFun, 
			       {PacketSize+1, PacketSize});
       not SlowEcho -> % Go on with bigger packets if not slow echo server.
	    ?line echo_packet1(Echo, Type, EchoFun, 10),
	    ?line echo_packet1(Echo, Type, EchoFun, 13),
	    ?line echo_packet1(Echo, Type, EchoFun, 126),
	    ?line echo_packet1(Echo, Type, EchoFun, 127),
	    ?line echo_packet1(Echo, Type, EchoFun, 128),
	    ?line echo_packet1(Echo, Type, EchoFun, 255),
	    ?line echo_packet1(Echo, Type, EchoFun, 256),
	    ?line echo_packet1(Echo, Type, EchoFun, 1023),
	    ?line echo_packet1(Echo, Type, EchoFun, 3747),
	    ?line echo_packet1(Echo, Type, EchoFun, 32767),
	    ?line echo_packet1(Echo, Type, EchoFun, 32768),
	    ?line echo_packet1(Echo, Type, EchoFun, 65531),
	    ?line echo_packet1(Echo, Type, EchoFun, 65535),
	    ?line echo_packet1(Echo, Type, EchoFun, 65536),
	    ?line echo_packet1(Echo, Type, EchoFun, 70000),
	    ?line echo_packet1(Echo, Type, EchoFun, infinite);
       true -> ok
    end,
    ?line gen_tcp:close(Echo),
    ok.

echo_packet1(EchoSock, Type, EchoFun, Size) ->
    ?line case packet(Size, Type) of
	      false ->
		  ok;
	      Packet ->
		  ?line io:format("Type ~p, size ~p, time ~p", 
				  [Type, Size, time()]),
		  ?line 
		      case EchoFun(EchoSock, Type, Packet, [Packet]) of
			  ok -> 
			      ?line 
				  case Size of
				      {N, Max} when N > Max -> 
					  ?line 
					      test_server:fail(
						{packet_through, {N, Max}});
				      _ -> ok
				  end;
			  {error, emsgsize} ->
			      ?line
				  case Size of
				      {N, Max} when N > Max -> 
					  io:format(" Blocked!");
				      _ -> 
					  ?line
					      test_server:fail(
						{packet_blocked, Size})
				  end;
			  Error ->
			      ?line test_server:fail(Error)
		      end
	  end.

active_echo(Sock, Type, Packet, PacketEchos) ->
    ?line ok = gen_tcp:send(Sock, Packet),
    active_recv(Sock, Type, PacketEchos).

active_recv(_, _, []) ->
    ok;
active_recv(Sock, Type, [PacketEcho|Tail]) ->
    Tag = case Type of 
	      http -> http;
	      http_bin -> http;
	      _ -> tcp
	  end,
    ?line receive Recv->Recv end,
    %%io:format("Active received: ~p\n",[Recv]),
    ?line case Recv of
	      {Tag, Sock, PacketEcho} ->
		  active_recv(Sock, Type, Tail);
	      {Tag, Sock, Bad} ->
		  ?line test_server:fail({wrong_data, Bad, expected, PacketEcho});
	      {tcp_error, Sock, Reason} ->
		  {error, Reason};
	      Other ->
		  ?line test_server:fail({unexpected_message, Other, Tag})
	  end.

passive_echo(Sock, _Type, Packet, PacketEchos) ->
    ?line ok = gen_tcp:send(Sock, Packet),
    passive_recv(Sock, PacketEchos).

passive_recv(_, []) ->
    ok;
passive_recv(Sock, [PacketEcho | Tail]) ->
    Recv = gen_tcp:recv(Sock, 0),
    %%io:format("Passive received: ~p\n",[Recv]),
    ?line case Recv of
	      {ok, PacketEcho} ->
		  passive_recv(Sock, Tail);
	      {ok, Bad} ->
		  io:format("Expected: ~p\nGot: ~p\n",[PacketEcho,Bad]),
		  ?line test_server:fail({wrong_data, Bad});
	      {error,PacketEcho} ->
		  passive_recv(Sock, Tail); % expected error
	      {error, _}=Error ->
		  Error;
	      Other ->
		  ?line test_server:fail({unexpected_message, Other})
	  end.

active_once_echo(Sock, Type, Packet, PacketEchos) ->
    ?line ok = gen_tcp:send(Sock, Packet),
    active_once_recv(Sock, Type, PacketEchos).

active_once_recv(_, _, []) ->
    ok;
active_once_recv(Sock, Type, [PacketEcho | Tail]) ->
    Tag = case Type of
	      http -> http;
	      http_bin -> http;
	      _ -> tcp
	  end,
    ?line receive
	      {Tag, Sock, PacketEcho} ->
		  inet:setopts(Sock, [{active, once}]),
		  active_once_recv(Sock, Type, Tail);
	      {Tag, Sock, Bad} ->
		  ?line test_server:fail({wrong_data, Bad});
	      {tcp_error, Sock, Reason} ->
		  {error, Reason};
	      Other ->
		  ?line test_server:fail({unexpected_message, Other, expected, {Tag, Sock, PacketEcho}})
	  end.

%%% Building of random packets.

packet(infinite, {asn1, _, Tag}) ->
    Tag++[16#80];
packet(infinite, _) ->
    false;
packet({Size, _RecvLimit}, Type) ->
    packet(Size, Type);
packet(Size, 1) when Size > 255 ->
    false;
packet(Size, 2) when Size > 65535 ->
    false;
packet(Size, {asn1, _, Tag}) when Size < 128 ->
    Tag++[Size|random_packet(Size)];
packet(Size, {asn1, short, Tag}) when Size < 256 ->
    Tag++[16#81, Size|random_packet(Size)];
packet(Size, {asn1, short, Tag}) when Size < 65536 ->
    Tag++[16#82|put_int16(Size, big, random_packet(Size))];
packet(Size, {asn1, _, Tag}) ->
    Tag++[16#84|put_int32(Size, big, random_packet(Size))];
packet(Size, {cdr, Endian}) ->
    [$G, $I, $O, $P,				% magic
     1, 0,					% major minor
     if Endian == big -> 0; true -> 1 end,	% flags: byte order
     0 |					% message type
     put_int32(Size, Endian, random_packet(Size))];
packet(Size, sunrm) ->
    put_int32(Size, big, random_packet(Size));
packet(Size, line) when Size > ?LINE_LENGTH ->
    false;
packet(Size, line) ->
    random_packet(Size, "\n");
packet(Size, tpkt) ->
    HeaderSize = 4,
    PacketSize = HeaderSize + Size,
    if PacketSize < 65536 ->
	    Header = [?TPKT_VRSN, 0 | put_int16(PacketSize, big)],
	    HeaderSize = length(Header), % Just to assert cirkular dependency
	    Header ++ random_packet(Size);
       true ->
	    false
    end;
packet(Size, _Type) ->
    random_packet(Size).



random_packet(Size) ->
    random_packet(Size, "", random_char()).

random_packet(Size, Tail) ->
    random_packet(Size, Tail, random_char()).

random_packet(0, Result, _NextChar) ->
    Result;
random_packet(Left, Result, NextChar0) ->
    NextChar =
	if
	    NextChar0 >= 126 ->
		33;
	    true ->
		NextChar0+1
	end,
    random_packet(Left-1, [NextChar0|Result], NextChar).

random_char() ->
    random_char("abcdefghijklmnopqrstuvxyzABCDEFGHIJKLMNOPQRSTUVXYZ0123456789").

random_char(Chars) ->
    lists:nth(uniform(length(Chars)), Chars).

uniform(N) ->
    case get(random_seed) of
	undefined ->
	    {X, Y, Z} = time(),
	    random:seed(X, Y, Z);
	_ ->
	    ok
    end,
    random:uniform(N).

put_int32(X, big, List) ->
    [ (X bsr 24) band 16#ff, 
      (X bsr 16) band 16#ff,
      (X bsr 8) band 16#ff,
      (X) band 16#ff | List ];
put_int32(X, little, List) ->
    [ (X) band 16#ff,
     (X bsr 8) band 16#ff,
     (X bsr 16) band 16#ff,
     (X bsr 24) band 16#ff | List].

put_int16(X, ByteOrder) ->
    put_int16(X, ByteOrder, []).

put_int16(X, big, List) ->
    [ (X bsr 8) band 16#ff,
      (X) band 16#ff | List ];
put_int16(X, little, List) ->
    [ (X) band 16#ff,
     (X bsr 8) band 16#ff | List ].

%%% A normal echo server, for systems that don't have one.

echo_server() ->
    Self = self(),
    ?line spawn_link(fun() -> echo_server(Self) end),
    ?line receive
	      {echo_port, Port} ->
		  {ok, Port}
    end.

echo_server(ReplyTo) ->
    {ok, S} = gen_tcp:listen(0, [{active, false}, binary]),
    {ok, {_, Port}} = inet:sockname(S),
    ReplyTo ! {echo_port, Port},
    echo_server_loop(S).

echo_server_loop(Sock) ->
    {ok, E} = gen_tcp:accept(Sock),
    Self = self(),
    spawn_link(fun() -> echoer(E, Self) end),
    echo_server_loop(Sock).

echoer(Sock, Parent) ->
    unlink(Parent),
    echoer_loop(Sock).

echoer_loop(Sock) ->
    case gen_tcp:recv(Sock, 0) of
	{ok, Data} ->
	    ok = gen_tcp:send(Sock, Data),
	    echoer_loop(Sock);
	{error, closed} ->
	    ok
    end.

%%% A "slow" echo server, which will echo data with a short delay
%%% between each character.

slow_echo_server() ->
    Self = self(),
    ?line spawn_link(fun() -> slow_echo_server(Self) end),
    ?line receive
	      {echo_port, Port} ->
		  {ok, Port}
	  end.

slow_echo_server(ReplyTo) ->
    {ok, S} = gen_tcp:listen(0, [{active, false}, {nodelay, true}]),
    {ok, {_, Port}} = inet:sockname(S),
    ReplyTo ! {echo_port, Port},
    slow_echo_server_loop(S).

slow_echo_server_loop(Sock) ->
    {ok, E} = gen_tcp:accept(Sock),
    spawn_link(fun() -> slow_echoer(E, self()) end),
    slow_echo_server_loop(Sock).

slow_echoer(Sock, Parent) ->
    unlink(Parent),
    slow_echoer_loop(Sock).

slow_echoer_loop(Sock) ->
    case gen_tcp:recv(Sock, 0) of
	{ok, Data} ->
	    slow_send(Sock, Data),
	    slow_echoer_loop(Sock);
	{error, closed} ->
	    ok
    end.

slow_send(Sock, [C|Rest]) ->
    ok = gen_tcp:send(Sock, [C]),
    receive after 1 ->
		    slow_send(Sock, Rest)
	    end;
slow_send(_, []) ->
    ok.

http_request(Uri) ->
    list_to_binary(["POST ", Uri, <<" HTTP/1.1\r\n"
     "Connection: close\r\n"
     "Host: localhost:8000\r\n"
     "User-Agent: perl post\r\n"
     "Content-Length: 4\r\n"
     "Content-Type: text/xml; charset=utf-8\r\n"
     "Other-Field: with some text\r\n"
     "Multi-Line: Once upon a time in a land far far away,\r\n"
     " there lived a princess imprisoned in the highest tower\r\n"
     " of the most haunted castle.\r\n"
     "Invalid line without a colon\r\n"
     "\r\n">>]).

http_uri_variants() ->
    ["*",
     "http://tools.ietf.org/html/rfcX3986",
     "http://otp.ericsson.se:8000/product/internal/",
     "https://example.com:8042/over/there?name=ferret#nose",
     "ftp://cnn.example.com&[email protected]/top_story.htm",
     "/some/absolute/path",
     "something_else", "something_else"].

http_response() ->
    <<"HTTP/1.0 404 Object Not Found\r\n"
     "Server: inets/4.7.16\r\n"
     "Date: Fri, 04 Jul 2008 17:16:22 GMT\r\n"
     "Content-Type: text/html\r\n"
     "Content-Length: 207\r\n"
     "\r\n">>.

http_reply(Bin, Type) ->
    {ok, Line, Rest} = erlang:decode_packet(Type,Bin,[]),
    HType = case Type of
		http -> httph;
		http_bin -> httph_bin
	    end,
    Ret = lists:reverse(http_reply(Rest,[Line],HType)),
    io:format("HTTP: ~p\n",[Ret]),
    Ret.

http_reply(<<>>, Acc, _) ->
    Acc;
http_reply(Bin, Acc, HType) ->
    {ok, Line, Rest} = erlang:decode_packet(HType,Bin,[]),	
    http_reply(Rest, [Line | Acc], HType).