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<h1 class="lined-header"><span>cowboy_req:read_part_body(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:read_part_body - Read the current part's body</p>
<h2 id="_description">Description</h2>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">read_part_body</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
<font color="#990000">-></font> <b><font color="#000000">read_part_body</font></b>(<font color="#009900">Req</font>, #{})
<b><font color="#000000">read_part_body</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> {<font color="#FF6600">ok</font>, <font color="#009900">Data</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>(), <font color="#009900">Req</font>}
| {<font color="#FF6600">more</font>, <font color="#009900">Data</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>(), <font color="#009900">Req</font>}
<font color="#009900">Opts</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:read_body_opts</font></b>()</tt></pre>
</div></div>
<p>Read the body of the current part of the multipart message.</p>
<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 returns the body of the current part. Examples of multipart media types are <code>multipart/form-data</code> and <code>multipart/byteranges</code>.</p>
<p>This function reads a chunk of the part's body. A <code>more</code> tuple is returned when more data remains to be read. Call the function repeatedly until an <code>ok</code> tuple is returned to read the entire body.</p>
<p>Once a part has been read, it can not be read again.</p>
<p>Once the body has been read, Cowboy sets the content-length header if it was not previously provided.</p>
<!-- @todo Limit the maximum size of multipart headers.-->
<h2 id="_arguments">Arguments</h2>
<dl><dt>Req</dt>
<dd><p>The Req object.</p>
</dd>
<dt>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>
<p>This function uses the same default options as the <a href="../cowboy_req.read_body">cowboy_req:read_body(3)</a> function.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>A <code>more</code> tuple is returned when there are more data to be read.</p>
<p>An <code>ok</code> tuple is returned when there are no more data to be read.</p>
<p>The data is always returned as a binary.</p>
<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>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Function introduced. Replaces <code>part_body/1,2</code>.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Read a full part's body</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">stream_body</font></b>(<font color="#009900">Req0</font>, <font color="#009900">Acc</font>) <font color="#990000">-></font>
<b><font color="#0000FF">case</font></b> <b><font color="#000000">cowboy_req:read_part_body</font></b>(<font color="#009900">Req0</font>) <b><font color="#0000FF">of</font></b>
{<font color="#FF6600">more</font>, <font color="#009900">Data</font>, <font color="#009900">Req</font>} <font color="#990000">-></font>
<b><font color="#000000">stream_body</font></b>(<font color="#009900">Req</font>, <font color="#990000"><<</font> <font color="#009900">Acc</font><font color="#990000">/</font><b><font color="#000080">binary</font></b>, <font color="#009900">Data</font><font color="#990000">/</font><b><font color="#000080">binary</font></b> <font color="#990000">>></font>);
{<font color="#FF6600">ok</font>, <font color="#009900">Data</font>, <font color="#009900">Req</font>} <font color="#990000">-></font>
{<font color="#FF6600">ok</font>, <font color="#990000"><<</font> <font color="#009900">Acc</font><font color="#990000">/</font><b><font color="#000080">binary</font></b>, <font color="#009900">Data</font><font color="#990000">/</font><b><font color="#000080">binary</font></b> <font color="#990000">>></font>, <font color="#009900">Req</font>}
<b><font color="#0000FF">end</font></b><font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Ensure a part's body is smaller than 64KB</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>{<font color="#FF6600">ok</font>, <font color="#009900">Body</font>, <font color="#009900">Req</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy_req:read_part_body</font></b>(<font color="#009900">Req0</font>, #{<b><font color="#000080">length</font></b> <font color="#990000">=></font> <font color="#993399">64000</font>})<font color="#990000">.</font></tt></pre>
</div></div>
<h2 id="_see_also">See also</h2>
<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">cowboy_req:read_part(3)</a></p>
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