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<h1 class="lined-header"><span>cowboy_req:stream_trailers(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:stream_trailers - Send the response trailers</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">stream_trailers</font></b>(<font color="#009900">Trailers</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="#FF6600">ok</font>
<font color="#009900">Trailers</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:http_headers</font></b>()</tt></pre>
</div></div>
<p>Send the response trailers and terminate the stream.</p>
<p>This function can only be called once, after initiating a response using <a href="../cowboy_req.stream_reply">cowboy_req:stream_reply(3)</a> and sending zero or more body chunks using <a href="../cowboy_req.stream_body">cowboy_req:stream_body(3)</a> with the <code>nofin</code> argument set. The function <code>stream_trailers/2</code> implies <code>fin</code> and automatically terminate the response.</p>
<p>You must list all field names sent in trailers in the trailer header, otherwise they might be dropped by intermediaries or clients.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Trailers</dt>
<dd><p>Trailer field values to be sent.</p>
</dd>
<dt>Req</dt>
<dd><p>The Req object.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>The atom <code>ok</code> is always returned. It can be safely ignored.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.2</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Stream a response body with trailers</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:stream_reply</font></b>(<font color="#993399">200</font>, #{
<font color="#990000"><<</font><font color="#FF0000">"content-type"</font><font color="#990000">>></font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"text/plain"</font><font color="#990000">>></font>,
<font color="#990000"><<</font><font color="#FF0000">"trailer"</font><font color="#990000">>></font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"expires, content-md5"</font><font color="#990000">>></font>
}, <font color="#009900">Req0</font>),
<b><font color="#000000">cowboy_req:stream_body</font></b>(<font color="#990000"><<</font><font color="#FF0000">"Hello\n"</font><font color="#990000">>></font>, <font color="#FF6600">nofin</font>, <font color="#009900">Req</font>),
<b><font color="#000000">timer:sleep</font></b>(<font color="#993399">1000</font>),
<b><font color="#000000">cowboy_req:stream_body</font></b>(<font color="#990000"><<</font><font color="#FF0000">"World!\n"</font><font color="#990000">>></font>, <font color="#FF6600">nofin</font>, <font color="#009900">Req</font>)<font color="#990000">.</font>
<b><font color="#000000">cowboy_req:stream_trailers</font></b>(#{
<font color="#990000"><<</font><font color="#FF0000">"expires"</font><font color="#990000">>></font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"Sun, 10 Dec 2017 19:13:47 GMT"</font><font color="#990000">>></font>,
<font color="#990000"><<</font><font color="#FF0000">"content-md5"</font><font color="#990000">>></font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"fbf68a8e34b2ded53bba54e68794b4fe"</font><font color="#990000">>></font>
}, <font color="#009900">Req</font>)<font color="#990000">.</font></tt></pre>
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<h2 id="_see_also">See also</h2>
<p><a href="../cowboy_req">cowboy_req(3)</a>, <a href="../cowboy_req.stream_reply">cowboy_req:stream_reply(3)</a>, <a href="../cowboy_req.stream_body">cowboy_req:stream_body(3)</a>, <a href="../cowboy_req.stream_events">cowboy_req:stream_events(3)</a></p>
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