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<h1 class="lined-header"><span>cowboy_req:reply(3)</span></h1>

<h2 id="_name">Name</h2>
<p>cowboy_req:reply - Send the response</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">reply</font></b>(<font color="#009900">Status</font>, <font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
    <font color="#990000">-&gt;</font> <b><font color="#000000">reply</font></b>(<font color="#009900">StatusCode</font>, #{}, <font color="#009900">Req</font>)

<b><font color="#000000">reply</font></b>(<font color="#009900">Status</font>, <font color="#009900">Headers</font>, <font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>())
    <font color="#990000">-&gt;</font> <font color="#009900">Req</font>

<b><font color="#000000">reply</font></b>(<font color="#009900">Status</font>, <font color="#009900">Headers</font>, <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">-&gt;</font> <font color="#009900">Req</font>

<font color="#009900">Status</font>  <font color="#990000">::</font> <b><font color="#000000">cowboy:http_status</font></b>()
<font color="#009900">Headers</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:http_headers</font></b>()
<font color="#009900">Body</font>    <font color="#990000">::</font> <b><font color="#000000">cowboy_req:resp_body</font></b>()</tt></pre>
</div></div>
<p>Send the response.</p>
<p>The header names must be given as lowercase binary strings. While header names are case insensitive, Cowboy requires them to be given as lowercase to function properly.</p>
<p>Cowboy does not allow duplicate header names. Headers set by this function may overwrite those set by <code>set_resp_header/3</code> and <code>set_resp_headers/2</code>.</p>
<p>Use <a href="../cowboy_req.set_resp_cookie">cowboy_req:set_resp_cookie(3)</a> instead of this function to set cookies.</p>
<p>The <code>reply/2,3</code> functions will send the body set previously, if any. The <code>reply/4</code> function always sends the given body, overriding any previously set.</p>
<p>You do not need to set the content-length header when sending a response body. Cowboy takes care of it automatically. You should however provide a content-type header.</p>
<p>No further data can be transmitted after this function returns. This includes the push mechanism. Attempting to send two replies, or to push resources after a reply has been sent, will result in an error.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Status</dt>
<dd><p>The status code for the response.</p>
</dd>
<dt>Headers</dt>
<dd><p>The response headers.</p>
<p>Header names must be given as lowercase binary strings.</p>
</dd>
<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 should be used from that point onward as it contains updated information about the state of the request.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Only the Req is returned, it is no longer wrapped in a tuple.
</li>
<li><strong>1.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Reply</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:reply</font></b>(<font color="#993399">404</font>, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Reply with custom headers</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:reply</font></b>(<font color="#993399">401</font>, #{
    <font color="#990000">&lt;&lt;</font><font color="#FF0000">"www-authenticate"</font><font color="#990000">&gt;&gt;</font> <font color="#990000">=&gt;</font> <font color="#990000">&lt;&lt;</font><font color="#FF0000">"Basic realm=\"erlang.org\""</font><font color="#990000">&gt;&gt;</font>
}, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Reply with custom headers and a 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:reply</font></b>(<font color="#993399">200</font>, #{
    <font color="#990000">&lt;&lt;</font><font color="#FF0000">"content-type"</font><font color="#990000">&gt;&gt;</font> <font color="#990000">=&gt;</font> <font color="#990000">&lt;&lt;</font><font color="#FF0000">"text/plain"</font><font color="#990000">&gt;&gt;</font>
}, <font color="#FF0000">"Hello world!"</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_cookie">cowboy_req:set_resp_cookie(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.set_resp_body">cowboy_req:set_resp_body(3)</a>, <a href="../cowboy_req.inform">cowboy_req:inform(3)</a>, <a href="../cowboy_req.stream_reply">cowboy_req:stream_reply(3)</a>, <a href="../cowboy_req.push">cowboy_req:push(3)</a></p>






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<h3>
	Cowboy
	2.7
	Function Reference
	
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		<li><a href="/docs/en/cowboy/2.7/guide">User Guide</a></li>
	
	
		<li><a href="/docs/en/cowboy/2.7/manual">Function Reference</a></li>
	
	
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<h4 id="docs-nav">Navigation</h4>

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