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authorIngela Anderton Andin <[email protected]>2017-06-01 16:09:11 +0200
committerIngela Anderton Andin <[email protected]>2017-09-12 15:13:06 +0200
commit5d01c70ca399edf28e99dc760506329689fab6ba (patch)
treef9ce0599805018e3884c91c07f9ba06c9b8c3269 /lib/inets/doc/src
parenta230f26086b3db9097f06d4bb91fb3b2e9379c77 (diff)
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inets: httpd - Add chunk handling of client data
If the client uses PUT or POST to send a HTTP body the server currently will gather the whole body in memory before passing it on to the mod-callback. For legacy reasons it also converts the binary body to a list, this is really bad for memory usage! Add new option max_client_body_chunk to enable chunked handling of content-length requests. Also make it possible for chunked-encoded data to be propagated in portions to the mod-callback. Conflicts: lib/inets/test/httpd_SUITE.erl
Diffstat (limited to 'lib/inets/doc/src')
-rw-r--r--lib/inets/doc/src/httpd.xml13
-rw-r--r--lib/inets/doc/src/mod_esi.xml69
2 files changed, 59 insertions, 23 deletions
diff --git a/lib/inets/doc/src/httpd.xml b/lib/inets/doc/src/httpd.xml
index d74635fc01..edf8731a82 100644
--- a/lib/inets/doc/src/httpd.xml
+++ b/lib/inets/doc/src/httpd.xml
@@ -279,7 +279,18 @@
requests defined by <c>max_keep_alive_requests</c>, the server
closes the connection. The server closes it even if there are
queued request. Default is no limit.</p>
- </item>
+ </item>
+
+
+ <tag><marker id="max_client_body_chunk"></marker>{max_client_body_chunk, integer()}</tag>
+ <item>
+ <p>Enforces chunking of a HTTP PUT or POST body data to be deliverd
+ to the mod_esi callback. Note this is not supported for mod_cgi.
+ Default is no limit e.i the whole body is deliverd as one entity, which could
+ be very memory consuming. <seealso marker="mod_esi">mod_esi(3)</seealso>.
+ </p>
+ </item>
+
</taglist>
<marker id="props_admin"></marker>
diff --git a/lib/inets/doc/src/mod_esi.xml b/lib/inets/doc/src/mod_esi.xml
index 46cc796c8a..e2f0758cdf 100644
--- a/lib/inets/doc/src/mod_esi.xml
+++ b/lib/inets/doc/src/mod_esi.xml
@@ -121,35 +121,61 @@
<funcs>
<func>
- <name>Module:Function(SessionID, Env, Input)-> _ </name>
+ <name>Module:Function(SessionID, Env, Input)-> {continue, State} | _ </name>
<fsummary>Creates a dynamic web page and returns it chunk by chunk
to the server process by calling <c>mod_esi:deliver/2</c>.</fsummary>
<type>
<v>SessionID = term()</v>
<v>Env = env()</v>
- <v>Input = string()</v>
+ <v>Input = string() | chunked_data()</v>
+ <v>chunked_data() = {first, Data::binary()} |
+ {continue, Data::binary(), State::term()} |
+ {last, Data::binary(), State::term()} </v>
+ <v>State = term()</v>
</type>
<desc>
<p><c>Module</c> must be found in the code path and export
<c>Function</c> with an arity of three. An <c>erlScriptAlias</c> must
also be set up in the configuration file for the web server.</p>
- <p>If the HTTP request is a 'post' request and a body is sent,
- <c>content_length</c> is the length of the posted
- data. If 'get' is used, <c>query_string</c> is the data after
- <em>?</em> in the URL.</p>
- <p><c>ParsedHeader</c> is the HTTP request as a key-value tuple
- list. The keys in <c>ParsedHeader</c> are in lower case.</p>
- <p><c>SessionID</c> is an identifier
- the server uses when <c>deliver/2</c> is called. Do not
- assume anything about the datatype.</p>
- <p>Use this callback function to generate dynamic web
- content dynamically. When a part of the page is generated, send the
- data back to the client through <c>deliver/2</c>. Notice
- that the first chunk of data sent to the client must at
- least contain all HTTP header fields that the response
- will generate. If the first chunk does not contain the
- <em>end of HTTP header</em>, that is, <c>"\r\n\r\n",</c>
- the server assumes that no HTTP header fields will be generated.</p>
+
+ <p><c>mod_esi:deliver/2</c> shall be used to generate the response
+ to the client and <c>SessionID</c> is an identifier that shall by used when
+ calling this function, do not assume anything about
+ the datatype. This function may be called
+ several times to chunk the the respons data. Notice that the
+ first chunk of data sent to the client must at least contain
+ all HTTP header fields that the response will generate. If the
+ first chunk does not contain the <em>end of HTTP header</em>,
+ that is, <c>"\r\n\r\n",</c> the server assumes that no HTTP
+ header fields will be generated.</p>
+
+ <p><c>Env</c> environment data of the request see description above.</p>
+
+ <p><c>Input</c> is query data of a GET request or the body of
+ a PUT or POST request. The default behavior (legacy reasons)
+ for delivering the body, is that the whole body is gathered and
+ converted to a string. But if the httpd config parameter
+ <seealso
+ marker="httpd#max_client_body_chunk">max_client_body_chunk</seealso>
+ is set, the body will be delivered as binary chunks
+ instead. The maximum size of the chunks is either <seealso
+ marker="httpd#max_client_body_chunk">max_client_body_chunk</seealso>
+ or decide by the client if it uses HTTP chunked encoding
+ to send the body. When using the chunking
+ mechanism this callback must return {continue, State::term()}
+ for all calls where <c>Input</c> is <c>{first,
+ Data::binary()}</c> or <c>{continue, Data::binary(),
+ State::term()}</c>. When <c>Input</c> is <c>{last,
+ Data::binary(), State::term()}</c> the return value will be ignored.
+ <note><p>Note that if the body is
+ small all data may be delivered in only one chunk and then the
+ callback will be called with {last, Data::binary(), undefined}
+ without getting called with <c>{first,
+ Data::binary()}</c>.</p></note> The input <c>State</c> is
+ the last returned <c>State</c>, in it the callback can include
+ any data that it needs to keep track of when handling the chunks.
+ </p>
+ <p></p>
</desc>
</func>
@@ -159,14 +185,13 @@
This function is deprecated and is only kept for backwards compatibility.</fsummary>
<type>
<v>Env = env()</v>
- <v>Input = string()</v>
+ <v>Input = string() </v>
<v>Response = string()</v>
</type>
<desc>
<p>This callback format consumes much memory, as the
whole response must be generated before it is sent to the
- user. This function is deprecated and is only kept for backwards
- compatibility.
+ user. This callback format is deprecated.
For new development, use <c>Module:Function/3</c>.</p>
</desc>
</func>