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<h1 class="lined-header"><span>cowboy_req:set_resp_header(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:set_resp_header - Set a response header</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_header</font></b>(<font color="#009900">Name</font>, <font color="#009900">Value</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">Name</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>() <i><font color="#9A1900">%% lowercase; case insensitive</font></i>
<font color="#009900">Value</font> <font color="#990000">::</font> <b><font color="#000000">iodata</font></b>() <i><font color="#9A1900">%% case depends on header</font></i></tt></pre>
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<p>Set a header to be sent with the response.</p>
<p>The header name must be given as a lowercase binary string. 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 be overwritten by those set from the reply functions.</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>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Name</dt>
<dd><p>Header name as a lowercase binary string.</p>
</dd>
<dt>Value</dt>
<dd><p>Header value.</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 header will not be sent in the response.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>1.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Set a header in the response</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_header</font></b>(<font color="#990000"><<</font><font color="#FF0000">"allow"</font><font color="#990000">>></font>, <font color="#FF0000">"GET"</font>, <font color="#009900">Req0</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Construct a header using iolists</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_header</font></b>(<font color="#990000"><<</font><font color="#FF0000">"allow"</font><font color="#990000">>></font>,
[<b><font color="#000000">allowed_methods</font></b>(), <font color="#FF0000">", OPTIONS"</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_headers">cowboy_req:set_resp_headers(3)</a>, <a href="../cowboy_req.has_resp_header">cowboy_req:has_resp_header(3)</a>, <a href="../cowboy_req.resp_header">cowboy_req:resp_header(3)</a>, <a href="../cowboy_req.resp_headers">cowboy_req:resp_headers(3)</a>, <a href="../cowboy_req.delete_resp_header">cowboy_req:delete_resp_header(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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