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<title>Nine Nines: cowboy_req:set_resp_body(3)</title>
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<h1 class="lined-header"><span>cowboy_req:set_resp_body(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:set_resp_body - Set the response 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">set_resp_body</font></b>(<font color="#009900">Body</font>, <font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
<font color="#990000">-></font> <font color="#009900">Req</font>
<font color="#009900">Body</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:resp_body</font></b>()</tt></pre>
</div></div>
<p>Set the response body.</p>
<p>The response body will be sent when a reply is initiated. Note that the functions <code>stream_reply/2,3</code> and <code>reply/4</code> will override the body set by this function.</p>
<p>This function can also be used to remove a response body that was set previously. To do so, simply call this function with an empty body.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Body</dt>
<dd><p>The body can be either a binary value, an iolist or a <code>sendfile</code> tuple telling Cowboy to send the contents of a file.</p>
</dd>
<dt>Req</dt>
<dd><p>The Req object.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>A new Req object is returned.</p>
<p>The returned Req object must be used from that point onward, otherwise the body will not be sent in the response.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: The function now accepts a <code>sendfile</code> tuple.
</li>
<li><strong>2.0</strong>: The <code>set_resp_body_fun/2,3</code> functions were removed.
</li>
<li><strong>1.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Set the response 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><font color="#009900">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:set_resp_body</font></b>(<font color="#990000"><<</font><font color="#FF0000">"Hello world!"</font><font color="#990000">>></font>, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Set the response body as an iolist</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="#009900">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:set_resp_body</font></b>([
<font color="#FF0000">"<html><head><title>"</font>,
<b><font color="#000000">page_title</font></b>(),
<font color="#FF0000">"</title></head><body>"</font>,
<b><font color="#000000">page_body</font></b>(),
<font color="#FF0000">"</body></html>"</font>
], <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Tell Cowboy to send data from a file</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="#008080">#file_info</font>{<b><font color="#000080">size</font></b><font color="#990000">=</font><font color="#009900">Size</font>}} <font color="#990000">=</font> <b><font color="#000000">file:read_file_info</font></b>(<font color="#009900">Filename</font>),
<font color="#009900">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:set_resp_body</font></b>({<font color="#FF6600">sendfile</font>, <font color="#993399">0</font>, <font color="#009900">Size</font>, <font color="#009900">Filename</font>}, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Clear any previously set response 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><font color="#009900">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:set_resp_body</font></b>(<font color="#990000"><<>></font>, <font color="#009900">Req0</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.set_resp_header">cowboy_req:set_resp_header(3)</a>, <a href="../cowboy_req.set_resp_headers">cowboy_req:set_resp_headers(3)</a>, <a href="../cowboy_req.reply">cowboy_req:reply(3)</a>, <a href="../cowboy_req.stream_reply">cowboy_req:stream_reply(3)</a></p>
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<h4>Version select</h4>
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