summaryrefslogtreecommitdiffstats
path: root/docs/en/cowboy/2.0/manual/cowboy_stream/index.html
diff options
context:
space:
mode:
authorLoïc Hoguin <[email protected]>2018-06-13 09:54:12 +0200
committerLoïc Hoguin <[email protected]>2018-06-13 09:54:12 +0200
commit92b54aacc0de5446dd5497c39897b0bbff72e626 (patch)
treec3a98cfec636d1271f5804e5c19b35b208bba00d /docs/en/cowboy/2.0/manual/cowboy_stream/index.html
parent8b5c3dc972b99f174750123c9e4abc96259c34a9 (diff)
downloadninenines.eu-92b54aacc0de5446dd5497c39897b0bbff72e626.tar.gz
ninenines.eu-92b54aacc0de5446dd5497c39897b0bbff72e626.tar.bz2
ninenines.eu-92b54aacc0de5446dd5497c39897b0bbff72e626.zip
Rebuild using Asciideck
Diffstat (limited to 'docs/en/cowboy/2.0/manual/cowboy_stream/index.html')
-rw-r--r--docs/en/cowboy/2.0/manual/cowboy_stream/index.html497
1 files changed, 184 insertions, 313 deletions
diff --git a/docs/en/cowboy/2.0/manual/cowboy_stream/index.html b/docs/en/cowboy/2.0/manual/cowboy_stream/index.html
index 488e5d87..095b0831 100644
--- a/docs/en/cowboy/2.0/manual/cowboy_stream/index.html
+++ b/docs/en/cowboy/2.0/manual/cowboy_stream/index.html
@@ -62,411 +62,282 @@
<h1 class="lined-header"><span>cowboy_stream(3)</span></h1>
-<div class="sect1">
<h2 id="_name">Name</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>cowboy_handler - Stream handlers</p></div>
-</div>
-</div>
-<div class="sect1">
+<p>cowboy_handler - Stream handlers</p>
<h2 id="_description">Description</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The module <code>cowboy_stream</code> defines a callback interface
-and a protocol for handling HTTP streams.</p></div>
-<div class="paragraph"><p>An HTTP request and its associated response is called
-a stream. A connection may have many streams. In HTTP/1.1
-they are executed sequentially, while in HTTP/2 they are
-executed concurrently.</p></div>
-<div class="paragraph"><p>Cowboy calls the stream handler for nearly all events
-related to a stream. Exceptions vary depending on the
-protocol.</p></div>
-<div class="paragraph"><p>Extra care must be taken when implementing stream handlers
-to ensure compatibility. While some modification of the
-events and commands is allowed, it is generally not a good
-idea to completely omit them.</p></div>
-</div>
-</div>
-<div class="sect1">
+<p>The module <code>cowboy_stream</code> defines a callback interface and a protocol for handling HTTP streams.</p>
+<p>An HTTP request and its associated response is called a stream. A connection may have many streams. In HTTP/1.1 they are executed sequentially, while in HTTP/2 they are executed concurrently.</p>
+<p>Cowboy calls the stream handler for nearly all events related to a stream. Exceptions vary depending on the protocol.</p>
+<p>Extra care must be taken when implementing stream handlers to ensure compatibility. While some modification of the events and commands is allowed, it is generally not a good idea to completely omit them.</p>
<h2 id="_callbacks">Callbacks</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Stream handlers must implement the following interface:</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Stream handlers must implement the following interface:</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">init</span></span>(<span style="color: #009900">StreamID</span>, <span style="color: #009900">Req</span>, <span style="color: #009900">Opts</span>) <span style="color: #990000">-&gt;</span> {<span style="color: #009900">Commands</span>, <span style="color: #009900">State</span>}
-<span style="font-weight: bold"><span style="color: #000000">data</span></span>(<span style="color: #009900">StreamID</span>, <span style="color: #009900">IsFin</span>, <span style="color: #009900">Data</span>, <span style="color: #009900">State</span>) <span style="color: #990000">-&gt;</span> {<span style="color: #009900">Commands</span>, <span style="color: #009900">State</span>}
-<span style="font-weight: bold"><span style="color: #000000">info</span></span>(<span style="color: #009900">StreamID</span>, <span style="color: #009900">Info</span>, <span style="color: #009900">State</span>) <span style="color: #990000">-&gt;</span> {<span style="color: #009900">Commands</span>, <span style="color: #009900">State</span>}
-<span style="font-weight: bold"><span style="color: #000000">terminate</span></span>(<span style="color: #009900">StreamID</span>, <span style="color: #009900">Reason</span>, <span style="color: #009900">State</span>) <span style="color: #990000">-&gt;</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
-<span style="font-weight: bold"><span style="color: #000000">early_error</span></span>(<span style="color: #009900">StreamID</span>, <span style="color: #009900">Reason</span>, <span style="color: #009900">PartialReq</span>, <span style="color: #009900">Resp</span>, <span style="color: #009900">Opts</span>) <span style="color: #990000">-&gt;</span> <span style="color: #009900">Resp</span>
-
-<span style="color: #009900">StreamID</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_stream:streamid</span></span>()
-<span style="color: #009900">Req</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>()
-<span style="color: #009900">Opts</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:opts</span></span>()
-<span style="color: #009900">Commands</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_stream:commands</span></span>()
-<span style="color: #009900">State</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
-<span style="color: #009900">IsFin</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_stream:fin</span></span>()
-<span style="color: #009900">Data</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()
-<span style="color: #009900">Info</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
-<span style="color: #009900">Reason</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_stream:reason</span></span>()
-<span style="color: #009900">PartialReq</span> <span style="color: #990000">-</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:req</span></span>(), <span style="color: #FF6600">except</span> <span style="color: #FF6600">all</span> <span style="color: #FF6600">fields</span> <span style="color: #FF6600">are</span> <span style="color: #FF6600">optional</span>
-<span style="color: #009900">Resp</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_stream:resp_command</span></span>()</tt></pre></div></div>
-<div class="paragraph"><p>HTTP/1.1 will initialize a stream only when the request-line
-and all headers have been received. When errors occur before
-that point Cowboy will call the callback <code>early_error/5</code>
-with a partial request, the error reason and the response
-Cowboy intends to send. All other events go throuh the
-stream handler using the normal callbacks.</p></div>
-<div class="paragraph"><p>HTTP/2 will initialize the stream when the <code>HEADERS</code> block has
-been fully received and decoded. Any protocol error occuring
-before that will not result in a response being sent and
-will therefore not go through the stream handler. In addition
-Cowboy may terminate streams without sending an HTTP response
-back.</p></div>
-<div class="paragraph"><p>The stream is initialized by calling <code>init/3</code>. All streams
-that are initialized will eventually be terminated by calling
-<code>terminate/3</code>.</p></div>
-<div class="paragraph"><p>When Cowboy receives data for the stream it will call <code>data/4</code>.
-The data given is the request body after any transfer decoding
-has been applied.</p></div>
-<div class="paragraph"><p>When Cowboy receives a message addressed to a stream, or when
-Cowboy needs to inform the stream handler that an internal
-event has occurred, it will call <code>info/3</code>.</p></div>
-</div>
-</div>
-<div class="sect1">
+<pre><tt><b><font color="#000000">init</font></b>(<font color="#009900">StreamID</font>, <font color="#009900">Req</font>, <font color="#009900">Opts</font>) <font color="#990000">-&gt;</font> {<font color="#009900">Commands</font>, <font color="#009900">State</font>}
+<b><font color="#000000">data</font></b>(<font color="#009900">StreamID</font>, <font color="#009900">IsFin</font>, <font color="#009900">Data</font>, <font color="#009900">State</font>) <font color="#990000">-&gt;</font> {<font color="#009900">Commands</font>, <font color="#009900">State</font>}
+<b><font color="#000000">info</font></b>(<font color="#009900">StreamID</font>, <font color="#009900">Info</font>, <font color="#009900">State</font>) <font color="#990000">-&gt;</font> {<font color="#009900">Commands</font>, <font color="#009900">State</font>}
+<b><font color="#000000">terminate</font></b>(<font color="#009900">StreamID</font>, <font color="#009900">Reason</font>, <font color="#009900">State</font>) <font color="#990000">-&gt;</font> <b><font color="#000000">any</font></b>()
+<b><font color="#000000">early_error</font></b>(<font color="#009900">StreamID</font>, <font color="#009900">Reason</font>, <font color="#009900">PartialReq</font>, <font color="#009900">Resp</font>, <font color="#009900">Opts</font>) <font color="#990000">-&gt;</font> <font color="#009900">Resp</font>
+
+<font color="#009900">StreamID</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_stream:streamid</font></b>()
+<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>()
+<font color="#009900">Opts</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:opts</font></b>()
+<font color="#009900">Commands</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_stream:commands</font></b>()
+<font color="#009900">State</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>()
+<font color="#009900">IsFin</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_stream:fin</font></b>()
+<font color="#009900">Data</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>()
+<font color="#009900">Info</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>()
+<font color="#009900">Reason</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_stream:reason</font></b>()
+<font color="#009900">PartialReq</font> <font color="#990000">-</font> <b><font color="#000000">cowboy_req:req</font></b>(), <font color="#FF6600">except</font> <font color="#FF6600">all</font> <font color="#FF6600">fields</font> <font color="#FF6600">are</font> <font color="#FF6600">optional</font>
+<font color="#009900">Resp</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_stream:resp_command</font></b>()</tt></pre>
+</div></div>
+<p>HTTP/1.1 will initialize a stream only when the request-line and all headers have been received. When errors occur before that point Cowboy will call the callback <code>early_error/5</code> with a partial request, the error reason and the response Cowboy intends to send. All other events go throuh the stream handler using the normal callbacks.</p>
+<p>HTTP/2 will initialize the stream when the <code>HEADERS</code> block has been fully received and decoded. Any protocol error occuring before that will not result in a response being sent and will therefore not go through the stream handler. In addition Cowboy may terminate streams without sending an HTTP response back.</p>
+<p>The stream is initialized by calling <code>init/3</code>. All streams that are initialized will eventually be terminated by calling <code>terminate/3</code>.</p>
+<p>When Cowboy receives data for the stream it will call <code>data/4</code>. The data given is the request body after any transfer decoding has been applied.</p>
+<p>When Cowboy receives a message addressed to a stream, or when Cowboy needs to inform the stream handler that an internal event has occurred, it will call <code>info/3</code>.</p>
<h2 id="commands">Commands</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Stream handlers can return a list of commands to be executed
-from the <code>init/3</code>, <code>data/4</code> and <code>info/3</code> callbacks. In addition,
-the <code>early_error/5</code> callback must return a response command.</p></div>
-<div class="paragraph"><p>The following commands are defined:</p></div>
-<div class="sect2">
+<p>Stream handlers can return a list of commands to be executed from the <code>init/3</code>, <code>data/4</code> and <code>info/3</code> callbacks. In addition, the <code>early_error/5</code> callback must return a response command.</p>
+<!-- @todo We need a &apos;log&apos; command that would call error_logger.-->
+<!-- It&apos;s better than doing in the handlers directly because-->
+<!-- then we can have other stream handlers manipulate those logs.-->
+<!-- @todo We need a command to send a message so that other-->
+<!-- stream handlers can manipulate these messages if necessary.-->
+<p>The following commands are defined:</p>
<h3 id="response_command">response</h3>
-<div class="paragraph"><p>Send a response to the client.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Send a response to the client.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">response</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_status</span></span>(), <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(),
- <span style="font-weight: bold"><span style="color: #000000">cowboy_req:resp_body</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>No more data can be sent after this command.</p></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">response</font>, <b><font color="#000000">cowboy:http_status</font></b>(), <b><font color="#000000">cowboy:http_headers</font></b>(),
+ <b><font color="#000000">cowboy_req:resp_body</font></b>()}</tt></pre>
+</div></div>
+<p>No more data can be sent after this command.</p>
<h3 id="headers_command">headers</h3>
-<div class="paragraph"><p>Initiate a response to the client.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Initiate a response to the client.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">headers</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_status</span></span>(), <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>This initiates a response to the client. The stream
-will end when a data command with the <code>fin</code> flag is
-returned.</p></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">headers</font>, <b><font color="#000000">cowboy:http_status</font></b>(), <b><font color="#000000">cowboy:http_headers</font></b>()}</tt></pre>
+</div></div>
+<p>This initiates a response to the client. The stream will end when a data command with the <code>fin</code> flag is returned.</p>
<h3 id="data_command">data</h3>
-<div class="paragraph"><p>Send data to the client.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Send data to the client.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">data</span>, <span style="font-weight: bold"><span style="color: #000000">fin</span></span>(), <span style="font-weight: bold"><span style="color: #000000">iodata</span></span>()}</tt></pre></div></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">data</font>, <b><font color="#000000">fin</font></b>(), <b><font color="#000000">iodata</font></b>()}</tt></pre>
+</div></div>
<h3 id="push_command">push</h3>
-<div class="paragraph"><p>Push a resource to the client.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Push a resource to the client.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">push</span>, <span style="color: #009900">Method</span>, <span style="color: #009900">Scheme</span>, <span style="color: #009900">Host</span>, <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>(),
- <span style="color: #009900">Path</span>, <span style="color: #009900">Qs</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>()}
+<pre><tt>{<font color="#FF6600">push</font>, <font color="#009900">Method</font>, <font color="#009900">Scheme</font>, <font color="#009900">Host</font>, <b><font color="#000000">inet:port_number</font></b>(),
+ <font color="#009900">Path</font>, <font color="#009900">Qs</font>, <b><font color="#000000">cowboy:http_headers</font></b>()}
-<span style="color: #009900">Method</span> <span style="color: #990000">=</span> <span style="color: #009900">Scheme</span> <span style="color: #990000">=</span> <span style="color: #009900">Host</span> <span style="color: #990000">=</span> <span style="color: #009900">Path</span> <span style="color: #990000">=</span> <span style="color: #009900">Qs</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()</tt></pre></div></div>
-<div class="paragraph"><p>The command will be ignored if the protocol does not provide
-any server push mechanism.</p></div>
-</div>
-<div class="sect2">
+<font color="#009900">Method</font> <font color="#990000">=</font> <font color="#009900">Scheme</font> <font color="#990000">=</font> <font color="#009900">Host</font> <font color="#990000">=</font> <font color="#009900">Path</font> <font color="#990000">=</font> <font color="#009900">Qs</font> <font color="#990000">=</font> <b><font color="#000080">binary</font></b>()</tt></pre>
+</div></div>
+<p>The command will be ignored if the protocol does not provide any server push mechanism.</p>
<h3 id="_flow">flow</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">flow</span>, <span style="font-weight: bold"><span style="color: #000000">pos_integer</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>Request more data to be read from the request body. The
-exact behavior depends on the protocol.</p></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">flow</font>, <b><font color="#000000">pos_integer</font></b>()}</tt></pre>
+</div></div>
+<p>Request more data to be read from the request body. The exact behavior depends on the protocol.</p>
<h3 id="_spawn">spawn</h3>
-<div class="paragraph"><p>Inform Cowboy that a process was spawned and should be
-supervised.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Inform Cowboy that a process was spawned and should be supervised.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="font-weight: bold"><span style="color: #000080">spawn</span></span>, <span style="font-weight: bold"><span style="color: #000080">pid</span></span>(), <span style="font-weight: bold"><span style="color: #000000">timeout</span></span>()}</tt></pre></div></div>
-</div>
-<div class="sect2">
+<pre><tt>{<b><font color="#000080">spawn</font></b>, <b><font color="#000080">pid</font></b>(), <b><font color="#000000">timeout</font></b>()}</tt></pre>
+</div></div>
<h3 id="_error_response">error_response</h3>
-<div class="paragraph"><p>Send an error response if no response was sent previously.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Send an error response if no response was sent previously.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">error_response</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_status</span></span>(), <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(), <span style="font-weight: bold"><span style="color: #000000">iodata</span></span>()}</tt></pre></div></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">error_response</font>, <b><font color="#000000">cowboy:http_status</font></b>(), <b><font color="#000000">cowboy:http_headers</font></b>(), <b><font color="#000000">iodata</font></b>()}</tt></pre>
+</div></div>
<h3 id="switch_protocol_command">switch_protocol</h3>
-<div class="paragraph"><p>Switch to a different protocol.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Switch to a different protocol.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">switch_protocol</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(), <span style="font-weight: bold"><span style="color: #000000">module</span></span>(), <span style="font-weight: bold"><span style="color: #000000">state</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>Contains the headers that will be sent in the 101 response,
-along with the module implementing the protocol we are
-switching to and its initial state.</p></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#FF6600">switch_protocol</font>, <b><font color="#000000">cowboy:http_headers</font></b>(), <b><font color="#000000">module</font></b>(), <b><font color="#000000">state</font></b>()}</tt></pre>
+</div></div>
+<p>Contains the headers that will be sent in the 101 response, along with the module implementing the protocol we are switching to and its initial state.</p>
<h3 id="_stop">stop</h3>
-<div class="paragraph"><p>Stop the stream.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Stop the stream.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="color: #FF6600">stop</span></tt></pre></div></div>
-<div class="paragraph"><p>While no more data can be sent after the <code>fin</code> flag was set,
-the stream is still tracked by Cowboy until it is stopped by
-the handler.</p></div>
-<div class="paragraph"><p>The behavior when stopping a stream for which no response
-has been sent will vary depending on the protocol. The stream
-will end successfully as far as the client is concerned.</p></div>
-<div class="paragraph"><p>To indicate that an error occurred, either use <code>error_response</code>
-before stopping, or use <code>internal_error</code>.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><font color="#FF6600">stop</font></tt></pre>
+</div></div>
+<p>While no more data can be sent after the <code>fin</code> flag was set, the stream is still tracked by Cowboy until it is stopped by the handler.</p>
+<p>The behavior when stopping a stream for which no response has been sent will vary depending on the protocol. The stream will end successfully as far as the client is concerned.</p>
+<p>To indicate that an error occurred, either use <code>error_response</code> before stopping, or use <code>internal_error</code>.</p>
<h3 id="_internal_error">internal_error</h3>
-<div class="paragraph"><p>Stop the stream with an error.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<p>Stop the stream with an error.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #FF6600">internal_error</span>, <span style="color: #009900">Reason</span>, <span style="color: #009900">HumanReadable</span>}
-
-<span style="color: #009900">Reason</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
-<span style="color: #009900">HumanReadable</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000080">atom</span></span>()</tt></pre></div></div>
-<div class="paragraph"><p>This command should be used when the stream cannot continue
-because of an internal error. An <code>error_response</code> command
-may be sent before that to advertise to the client why the
-stream is dropped.</p></div>
-</div>
-</div>
-</div>
-<div class="sect1">
+<pre><tt>{<font color="#FF6600">internal_error</font>, <font color="#009900">Reason</font>, <font color="#009900">HumanReadable</font>}
+
+<font color="#009900">Reason</font> <font color="#990000">=</font> <b><font color="#000000">any</font></b>()
+<font color="#009900">HumanReadable</font> <font color="#990000">=</font> <b><font color="#000080">atom</font></b>()</tt></pre>
+</div></div>
+<p>This command should be used when the stream cannot continue because of an internal error. An <code>error_response</code> command may be sent before that to advertise to the client why the stream is dropped.</p>
<h2 id="_predefined_events">Predefined events</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>Cowboy will forward all messages sent to the stream to
-the <code>info/3</code> callback. To send a message to a stream,
-send a message to the connection process with the form
-<code>{{Pid, StreamID}, Msg}</code>. The connection process will
-then forward <code>Msg</code> to the stream handlers.</p></div>
-<div class="paragraph"><p>Cowboy will also forward the exit signals for the
-processes that the stream spawned.</p></div>
-<div class="sect2">
+<p>Cowboy will forward all messages sent to the stream to the <code>info/3</code> callback. To send a message to a stream, send a message to the connection process with the form <code>{{Pid, StreamID}, Msg}</code>. The connection process will then forward <code>Msg</code> to the stream handlers.</p>
+<p>Cowboy will also forward the exit signals for the processes that the stream spawned.</p>
<h3 id="_exit">EXIT</h3>
-<div class="paragraph"><p>A process spawned by this stream has exited.</p></div>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<!-- info(_StreamID, {&apos;EXIT&apos;, Pid, normal}, State=#state{pid=Pid}) -&gt;-->
+<!-- info(_StreamID, {&apos;EXIT&apos;, Pid, {_Reason, [_, {cow_http_hd, _, _, _}|_]}}, State=#state{pid=Pid}) -&gt;-->
+<!-- info(StreamID, Exit = {&apos;EXIT&apos;, Pid, {Reason, Stacktrace}}, State=#state{ref=Ref, pid=Pid}) -&gt;-->
+<p>A process spawned by this stream has exited.</p>
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt>{<span style="color: #000080">'EXIT'</span>, <span style="font-weight: bold"><span style="color: #000080">pid</span></span>(), <span style="font-weight: bold"><span style="color: #000000">any</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>This is the raw exit message without any modification.</p></div>
-</div>
-<div class="sect2">
+<pre><tt>{<font color="#000080">'EXIT'</font>, <b><font color="#000080">pid</font></b>(), <b><font color="#000000">any</font></b>()}</tt></pre>
+</div></div>
+<p>This is the raw exit message without any modification.</p>
+<!-- === read_body-->
+<!-- -->
+<!-- //info(_StreamID, {read_body, Ref, Length, _},-->
+<!-- //info(StreamID, {read_body, Ref, Length, Period}, State) -&gt;-->
+<!-- -->
+<!-- TODO yeah I am not actually sure this one should be public just yet-->
+<!-- TODO if it is, then we probably shouldn&apos;t send a message directly,-->
+<!-- TODO but rather return a command that will end up sending the message-->
+<!-- -->
+<!-- TODO The problem being that no stream handler has access to that-->
+<!-- TODO message if we send it directly. So we should have a command-->
+<!-- TODO send_message or something that can be seen from all handlers.-->
+<!-- -->
+<!-- TODO The thing is that stream handlers can have 0 to N processes-->
+<!-- TODO so we have to make it easy to say which process should-->
+<!-- TODO receive the message, and perhaps *identify* which process-->
+<!-- TODO gets it?-->
<h3 id="_response">response</h3>
-<div class="paragraph"><p>Same as the <a href="../response_command">response command</a>.</p></div>
-<div class="paragraph"><p>Usually sent when the request process replies to the client.
-May also be sent by Cowboy internally.</p></div>
-</div>
-<div class="sect2">
+<p>Same as the <a href="../response_command">response command</a>.</p>
+<p>Usually sent when the request process replies to the client. May also be sent by Cowboy internally.</p>
<h3 id="_headers">headers</h3>
-<div class="paragraph"><p>Same as the <a href="../headers_command">headers command</a>.</p></div>
-<div class="paragraph"><p>Sent when the request process starts replying to the client.</p></div>
-</div>
-<div class="sect2">
+<p>Same as the <a href="../headers_command">headers command</a>.</p>
+<p>Sent when the request process starts replying to the client.</p>
<h3 id="_data">data</h3>
-<div class="paragraph"><p>Same as the <a href="../data_command">data command</a>.</p></div>
-<div class="paragraph"><p>Sent when the request process streams data to the client.</p></div>
-</div>
-<div class="sect2">
+<p>Same as the <a href="../data_command">data command</a>.</p>
+<p>Sent when the request process streams data to the client.</p>
<h3 id="_push">push</h3>
-<div class="paragraph"><p>Same as the <a href="../push_command">push command</a>.</p></div>
-<div class="paragraph"><p>Sent when the request process pushes a resource to the client.</p></div>
-</div>
-<div class="sect2">
+<p>Same as the <a href="../push_command">push command</a>.</p>
+<p>Sent when the request process pushes a resource to the client.</p>
<h3 id="_switch_protocol">switch_protocol</h3>
-<div class="paragraph"><p>Same as the <a href="../switch_protocol_command">switch_protocol command</a>.</p></div>
-<div class="paragraph"><p>Sent when switching to the HTTP/2 or Websocket protocol.</p></div>
-</div>
-</div>
-</div>
-<div class="sect1">
+<p>Same as the <a href="../switch_protocol_command">switch_protocol command</a>.</p>
+<!-- @todo Not done for HTTP/2 yet.-->
+<p>Sent when switching to the HTTP/2 or Websocket protocol.</p>
<h2 id="_exports">Exports</h2>
-<div class="sectionbody">
-<div class="paragraph"><p>The following function should be called by modules implementing
-stream handlers to execute the next stream handler in the list:</p></div>
-<div class="ulist"><ul>
-<li>
-<p>
-<a href="../cowboy_stream.init">cowboy_stream:init(3)</a> - Initialize a stream
-</p>
+<p>The following function should be called by modules implementing stream handlers to execute the next stream handler in the list:</p>
+<ul><li><a href="../cowboy_stream.init">cowboy_stream:init(3)</a> - Initialize a stream
</li>
-<li>
-<p>
-<a href="../cowboy_stream.data">cowboy_stream:data(3)</a> - Handle data for a stream
-</p>
+<li><a href="../cowboy_stream.data">cowboy_stream:data(3)</a> - Handle data for a stream
</li>
-<li>
-<p>
-<a href="../cowboy_stream.info">cowboy_stream:info(3)</a> - Handle a message for a stream
-</p>
+<li><a href="../cowboy_stream.info">cowboy_stream:info(3)</a> - Handle a message for a stream
</li>
-<li>
-<p>
-<a href="../cowboy_stream.terminate">cowboy_stream:terminate(3)</a> - Terminate a stream
-</p>
+<li><a href="../cowboy_stream.terminate">cowboy_stream:terminate(3)</a> - Terminate a stream
</li>
-<li>
-<p>
-<a href="../cowboy_stream.early_error">cowboy_stream:early_error(3)</a> - Handle an early error for a stream
-</p>
+<li><a href="../cowboy_stream.early_error">cowboy_stream:early_error(3)</a> - Handle an early error for a stream
</li>
-</ul></div>
-</div>
-</div>
-<div class="sect1">
+</ul>
<h2 id="_types">Types</h2>
-<div class="sectionbody">
-<div class="sect2">
<h3 id="_commands">commands()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">commands</span></span>() <span style="color: #990000">::</span> [<span style="color: #009900">Command</span>]</tt></pre></div></div>
-<div class="paragraph"><p>See the <a href="../commands">list of commands</a> for details.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><b><font color="#000000">commands</font></b>() <font color="#990000">::</font> [<font color="#009900">Command</font>]</tt></pre>
+</div></div>
+<p>See the <a href="../commands">list of commands</a> for details.</p>
<h3 id="_fin">fin()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">fin</span></span>() <span style="color: #990000">::</span> <span style="color: #FF6600">fin</span> | <span style="color: #FF6600">nofin</span></tt></pre></div></div>
-<div class="paragraph"><p>Used in commands and events to indicate that this is
-the end of the stream.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><b><font color="#000000">fin</font></b>() <font color="#990000">::</font> <font color="#FF6600">fin</font> | <font color="#FF6600">nofin</font></tt></pre>
+</div></div>
+<p>Used in commands and events to indicate that this is the end of the stream.</p>
<h3 id="_partial_req">partial_req()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">req</span></span>() <span style="color: #990000">::</span> #{
- <span style="color: #0000FF">method</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
- <span style="color: #0000FF">version</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_version</span></span>() | <span style="font-weight: bold"><span style="color: #000080">atom</span></span>(),
- <span style="color: #0000FF">scheme</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
- <span style="color: #0000FF">host</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="font-style: italic"><span style="color: #9A1900">%% lowercase; case insensitive</span></span>
- <span style="color: #0000FF">port</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>(),
- <span style="color: #0000FF">path</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
- <span style="color: #0000FF">qs</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>(), <span style="font-style: italic"><span style="color: #9A1900">%% case sensitive</span></span>
- <span style="color: #0000FF">headers</span> <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(),
- <span style="color: #0000FF">peer</span> <span style="color: #990000">=&gt;</span> {<span style="font-weight: bold"><span style="color: #000000">inet:ip_address</span></span>(), <span style="font-weight: bold"><span style="color: #000000">inet:port_number</span></span>()}
-}</tt></pre></div></div>
-<div class="paragraph"><p>Partial request information received when an early error is
-detected.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><b><font color="#000000">req</font></b>() <font color="#990000">::</font> #{
+ <font color="#0000FF">method</font> <font color="#990000">=&gt;</font> <b><font color="#000080">binary</font></b>(), <i><font color="#9A1900">%% case sensitive</font></i>
+ <font color="#0000FF">version</font> <font color="#990000">=&gt;</font> <b><font color="#000000">cowboy:http_version</font></b>() | <b><font color="#000080">atom</font></b>(),
+ <font color="#0000FF">scheme</font> <font color="#990000">=&gt;</font> <b><font color="#000080">binary</font></b>(), <i><font color="#9A1900">%% lowercase; case insensitive</font></i>
+ <font color="#0000FF">host</font> <font color="#990000">=&gt;</font> <b><font color="#000080">binary</font></b>(), <i><font color="#9A1900">%% lowercase; case insensitive</font></i>
+ <font color="#0000FF">port</font> <font color="#990000">=&gt;</font> <b><font color="#000000">inet:port_number</font></b>(),
+ <font color="#0000FF">path</font> <font color="#990000">=&gt;</font> <b><font color="#000080">binary</font></b>(), <i><font color="#9A1900">%% case sensitive</font></i>
+ <font color="#0000FF">qs</font> <font color="#990000">=&gt;</font> <b><font color="#000080">binary</font></b>(), <i><font color="#9A1900">%% case sensitive</font></i>
+ <font color="#0000FF">headers</font> <font color="#990000">=&gt;</font> <b><font color="#000000">cowboy:http_headers</font></b>(),
+ <font color="#0000FF">peer</font> <font color="#990000">=&gt;</font> {<b><font color="#000000">inet:ip_address</font></b>(), <b><font color="#000000">inet:port_number</font></b>()}
+}</tt></pre>
+</div></div>
+<p>Partial request information received when an early error is detected.</p>
<h3 id="_reason">reason()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">reason</span></span>() <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000080">normal</span></span>
- | {<span style="color: #FF6600">internal_error</span>, <span style="color: #FF6600">timeout</span> | {<span style="color: #FF6600">error</span> | <span style="font-weight: bold"><span style="color: #000080">exit</span></span> | <span style="font-weight: bold"><span style="color: #000080">throw</span></span>, <span style="font-weight: bold"><span style="color: #000000">any</span></span>()}, <span style="color: #009900">HumanReadable</span>}
- | {<span style="color: #FF6600">socket_error</span>, <span style="color: #FF6600">closed</span> | <span style="font-weight: bold"><span style="color: #000080">atom</span></span>(), <span style="color: #009900">HumanReadable</span>}
- | {<span style="color: #FF6600">stream_error</span>, <span style="color: #009900">Error</span>, <span style="color: #009900">HumanReadable</span>}
- | {<span style="color: #FF6600">connection_error</span>, <span style="color: #009900">Error</span>, <span style="color: #009900">HumanReadable</span>}
- | {<span style="color: #FF6600">stop</span>, <span style="font-weight: bold"><span style="color: #000000">cow_http2:frame</span></span>(), <span style="color: #009900">HumanReadable</span>}
-
-<span style="color: #009900">Error</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000080">atom</span></span>()
-<span style="color: #009900">HumanReadable</span> <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000080">atom</span></span>()</tt></pre></div></div>
-<div class="paragraph"><p>Reason for the stream termination.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><b><font color="#000000">reason</font></b>() <font color="#990000">::</font> <b><font color="#000080">normal</font></b>
+ | {<font color="#FF6600">internal_error</font>, <font color="#FF6600">timeout</font> | {<font color="#FF6600">error</font> | <b><font color="#000080">exit</font></b> | <b><font color="#000080">throw</font></b>, <b><font color="#000000">any</font></b>()}, <font color="#009900">HumanReadable</font>}
+ | {<font color="#FF6600">socket_error</font>, <font color="#FF6600">closed</font> | <b><font color="#000080">atom</font></b>(), <font color="#009900">HumanReadable</font>}
+ | {<font color="#FF6600">stream_error</font>, <font color="#009900">Error</font>, <font color="#009900">HumanReadable</font>}
+ | {<font color="#FF6600">connection_error</font>, <font color="#009900">Error</font>, <font color="#009900">HumanReadable</font>}
+ | {<font color="#FF6600">stop</font>, <b><font color="#000000">cow_http2:frame</font></b>(), <font color="#009900">HumanReadable</font>}
+
+<font color="#009900">Error</font> <font color="#990000">=</font> <b><font color="#000080">atom</font></b>()
+<font color="#009900">HumanReadable</font> <font color="#990000">=</font> <b><font color="#000080">atom</font></b>()</tt></pre>
+</div></div>
+<p>Reason for the stream termination.</p>
<h3 id="_resp_command">resp_command()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">resp_command</span></span>() <span style="color: #990000">::</span> {<span style="color: #FF6600">response</span>, <span style="font-weight: bold"><span style="color: #000000">cowboy:http_status</span></span>(),
- <span style="font-weight: bold"><span style="color: #000000">cowboy:http_headers</span></span>(), <span style="font-weight: bold"><span style="color: #000000">cowboy_req:resp_body</span></span>()}</tt></pre></div></div>
-<div class="paragraph"><p>See the <a href="../response_command">response command</a> for details.</p></div>
-</div>
-<div class="sect2">
+<pre><tt><b><font color="#000000">resp_command</font></b>() <font color="#990000">::</font> {<font color="#FF6600">response</font>, <b><font color="#000000">cowboy:http_status</font></b>(),
+ <b><font color="#000000">cowboy:http_headers</font></b>(), <b><font color="#000000">cowboy_req:resp_body</font></b>()}</tt></pre>
+</div></div>
+<p>See the <a href="../response_command">response command</a> for details.</p>
<h3 id="_streamid">streamid()</h3>
-<div class="listingblock">
-<div class="content"><!-- Generator: GNU source-highlight
+<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
-<pre><tt><span style="font-weight: bold"><span style="color: #000000">streamid</span></span>() <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()</tt></pre></div></div>
-<div class="paragraph"><p>The identifier for this stream.</p></div>
-<div class="paragraph"><p>The identifier is unique over the connection process.
-It is possible to form a unique identifier node-wide and
-cluster-wide by wrapping it in a <code>{self(), StreamID}</code>
-tuple.</p></div>
-</div>
-</div>
-</div>
-<div class="sect1">
+<pre><tt><b><font color="#000000">streamid</font></b>() <font color="#990000">::</font> <b><font color="#000000">any</font></b>()</tt></pre>
+</div></div>
+<p>The identifier for this stream.</p>
+<p>The identifier is unique over the connection process. It is possible to form a unique identifier node-wide and cluster-wide by wrapping it in a <code>{self(), StreamID}</code> tuple.</p>
<h2 id="_changelog">Changelog</h2>
-<div class="sectionbody">
-<div class="ulist"><ul>
-<li>
-<p>
-<strong>2.0</strong>: Module introduced.
-</p>
+<ul><li><strong>2.0</strong>: Module introduced.
</li>
-</ul></div>
-</div>
-</div>
-<div class="sect1">
+</ul>
<h2 id="_see_also">See also</h2>
-<div class="sectionbody">
-<div class="paragraph"><p><a href="..">cowboy(7)</a>,
-<a href="../cowboy_http">cowboy_http(3)</a>,
-<a href="../cowboy_http2">cowboy_http2(3)</a></p></div>
-</div>
-</div>
+<p><a href="..">cowboy(7)</a>, <a href="../cowboy_http">cowboy_http(3)</a>, <a href="../cowboy_http2">cowboy_http2(3)</a></p>
+