Add documentation for Cowboy 2.2

author: Loïc Hoguin <[email protected]> 2017-12-11 11:27:17 +0100
committer: Loïc Hoguin <[email protected]> 2017-12-11 11:27:17 +0100
commit: 1b863c350ba1f9b8ad1cb458df514ab0fe6bb127 (patch)
tree: f3f88acba06cce7095a047da8163ac0f92b1a64a /docs/en/cowboy/2.2/manual/cowboy_req.read_part/index.html
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+<h1 class="lined-header"><span>cowboy_req:read_part(3)</span></h1>
+
+<div class="sect1">
+<h2 id="_name">Name</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>cowboy_req:read_part - Read the next multipart headers</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">Description</h2>
+<div class="sectionbody">
+<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">read_part</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: #990000">-&gt;</span> <span style="font-weight: bold"><span style="color: #000000">read_part</span></span>(<span style="color: #009900">Req</span>, #{})
+
+<span style="font-weight: bold"><span style="color: #000000">read_part</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">-&gt;</span> {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Headers</span>, <span style="color: #009900">Req</span>} | {<span style="color: #FF6600">done</span>, <span style="color: #009900">Req</span>}
+
+<span style="color: #009900">Opts</span>    <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:read_body_opts</span></span>()
+<span style="color: #009900">Headers</span> <span style="color: #990000">::</span> #{<span style="font-weight: bold"><span style="color: #000080">binary</span></span>() <span style="color: #990000">=&gt;</span> <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()}</tt></pre></div></div>
+<div class="paragraph"><p>Read the next part of a multipart body.</p></div>
+<div class="paragraph"><p>This function reads the request body and parses it as
+multipart. Each parts of a multipart representation have
+their own headers and body. This function parses and returns
+headers. Examples of multipart media types are
+<code>multipart/form-data</code> and <code>multipart/byteranges</code>.</p></div>
+<div class="paragraph"><p>Cowboy will skip any data remaining until the beginning of
+the next part. This includes the preamble to the multipart
+message but also the body of a previous part if it hasn&#8217;t
+been read. Both are skipped automatically when calling this
+function.</p></div>
+<div class="paragraph"><p>Cowboy will read the body before parsing in chunks of size
+up to 64KB, with a period of 5 seconds. This is tailored for
+reading part headers and might not be the most efficient for
+skipping the previous part&#8217;s body.</p></div>
+<div class="paragraph"><p>The headers returned are MIME headers, <strong>NOT</strong> HTTP headers.
+They can be parsed using the functions from the <code>cow_multipart</code>
+module. In addition, the <code>cow_multipart:form_data/1</code> function
+can be used to quickly extract information from <code>multipart/form-data</code>
+representations.</p></div>
+<div class="paragraph"><p>Once a part has been read, it can not be read again.</p></div>
+<div class="paragraph"><p>Once the body has been read, Cowboy sets the content-length
+header if it was not previously provided.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_arguments">Arguments</h2>
+<div class="sectionbody">
+<div class="dlist"><dl>
+<dt class="hdlist1">
+Req
+</dt>
+<dd>
+<p>
+The Req object.
+</p>
+</dd>
+<dt class="hdlist1">
+Opts
+</dt>
+<dd>
+<p>
+A map of body reading options. Please refer to
+<a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a>
+for details about each option.
+</p>
+<div class="paragraph"><p>This function defaults the <code>length</code> to 64KB and the <code>period</code>
+to 5 seconds.</p></div>
+</dd>
+</dl></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_return_value">Return value</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>An <code>ok</code> tuple is returned containing the next part&#8217;s headers
+as a map.</p></div>
+<div class="paragraph"><p>A <code>done</code> tuple is returned if there are no more parts to read.</p></div>
+<div class="paragraph"><p>The Req object returned in the tuple must be used for that point
+onward. It contains a more up to date representation of the request.
+For example it may have an added content-length header once the
+body has been read.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_changelog">Changelog</h2>
+<div class="sectionbody">
+<div class="ulist"><ul>
+<li>
+<p>
+<strong>2.0</strong>: Function introduced. Replaces <code>part/1,2</code>.
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_examples">Examples</h2>
+<div class="sectionbody">
+<div class="listingblock">
+<div class="title">Read all parts</div>
+<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">acc_multipart</span></span>(<span style="color: #009900">Req0</span>, <span style="color: #009900">Acc</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:read_part</span></span>(<span style="color: #009900">Req0</span>) <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Headers</span>, <span style="color: #009900">Req1</span>} <span style="color: #990000">-&gt;</span>
+            {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Body</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">stream_body</span></span>(<span style="color: #009900">Req1</span>, <span style="color: #990000">&lt;&lt;&gt;&gt;</span>),
+            <span style="font-weight: bold"><span style="color: #000000">acc_multipart</span></span>(<span style="color: #009900">Req</span>, [{<span style="color: #009900">Headers</span>, <span style="color: #009900">Body</span>}|<span style="color: #009900">Acc</span>]);
+        {<span style="color: #FF6600">done</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">-&gt;</span>
+            {<span style="font-weight: bold"><span style="color: #000000">lists:reverse</span></span>(<span style="color: #009900">Acc</span>), <span style="color: #009900">Req</span>}
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span>
+
+<span style="font-weight: bold"><span style="color: #000000">stream_body</span></span>(<span style="color: #009900">Req0</span>, <span style="color: #009900">Acc</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:read_part_body</span></span>(<span style="color: #009900">Req0</span>) <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+        {<span style="color: #FF6600">more</span>, <span style="color: #009900">Data</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">-&gt;</span>
+            <span style="font-weight: bold"><span style="color: #000000">stream_body</span></span>(<span style="color: #009900">Req</span>, <span style="color: #990000">&lt;&lt;</span> <span style="color: #009900">Acc</span><span style="color: #990000">/</span><span style="font-weight: bold"><span style="color: #000080">binary</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: #990000">&gt;&gt;</span>);
+        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Data</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">-&gt;</span>
+            {<span style="color: #FF6600">ok</span>, <span style="color: #990000">&lt;&lt;</span> <span style="color: #009900">Acc</span><span style="color: #990000">/</span><span style="font-weight: bold"><span style="color: #000080">binary</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: #990000">&gt;&gt;</span>, <span style="color: #009900">Req</span>}
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
+<div class="listingblock">
+<div class="title">Read all part headers, skipping bodies</div>
+<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">skip_body_multipart</span></span>(<span style="color: #009900">Req0</span>, <span style="color: #009900">Acc</span>) <span style="color: #990000">-&gt;</span>
+    <span style="font-weight: bold"><span style="color: #0000FF">case</span></span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:read_part</span></span>(<span style="color: #009900">Req0</span>) <span style="font-weight: bold"><span style="color: #0000FF">of</span></span>
+        {<span style="color: #FF6600">ok</span>, <span style="color: #009900">Headers</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">-&gt;</span>
+            <span style="font-weight: bold"><span style="color: #000000">skip_body_multipart</span></span>(<span style="color: #009900">Req</span>, [<span style="color: #009900">Headers</span>|<span style="color: #009900">Acc</span>]);
+        {<span style="color: #FF6600">done</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">-&gt;</span>
+            {<span style="font-weight: bold"><span style="color: #000000">lists:reverse</span></span>(<span style="color: #009900">Acc</span>), <span style="color: #009900">Req</span>}
+    <span style="font-weight: bold"><span style="color: #0000FF">end</span></span><span style="color: #990000">.</span></tt></pre></div></div>
+<div class="listingblock">
+<div class="title">Read a part header in larger chunks</div>
+<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">ok</span>, <span style="color: #009900">Headers</span>, <span style="color: #009900">Req</span>} <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">cowboy_req:read_part</span></span>(<span style="color: #009900">Req0</span>, #{<span style="font-weight: bold"><span style="color: #000080">length</span></span> <span style="color: #990000">=&gt;</span> <span style="color: #993399">1000000</span>})<span style="color: #990000">.</span></tt></pre></div></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_see_also">See also</h2>
+<div class="sectionbody">
+<div class="paragraph"><p><a href="../cowboy_req">cowboy_req(3)</a>,
+<a href="../cowboy_req.has_body">cowboy_req:has_body(3)</a>,
+<a href="../cowboy_req.body_length">cowboy_req:body_length(3)</a>,
+<a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a>,
+<a href="../cowboy_req.read_urlencoded_body">cowboy_req:read_urlencoded_body(3)</a>,
+<a href="../cowboy_req.read_part_body">cowboy_req:read_part_body(3)</a></p></div>
+</div>
+</div>
+
+
+
+
+
+</div>
+
+<div class="span3 sidecol">
+
+
+<h3>
+	Cowboy
+	2.2
+	Function Reference
+	
+</h3>
+
+<ul>
+	
+		<li><a href="/docs/en/cowboy/2.2/guide">User Guide</a></li>
+	
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">Function Reference</a></li>
+	
+	
+</ul>
+
+<h4 id="docs-nav">Navigation</h4>
+
+<h4>Version select</h4>
+<ul>
+	
+	
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">2.2</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.1/manual">2.1</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.0/manual">2.0</a></li>
+	
+		<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
+	
+</ul>
+
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author	Loïc Hoguin <[email protected]>	2017-12-11 11:27:17 +0100
committer	Loïc Hoguin <[email protected]>	2017-12-11 11:27:17 +0100
commit	1b863c350ba1f9b8ad1cb458df514ab0fe6bb127 (patch)
tree	f3f88acba06cce7095a047da8163ac0f92b1a64a /docs/en/cowboy/2.2/manual/cowboy_req.read_part/index.html
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