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---
version: v1.5.2
layout: manpage_v2
title: nng_http_req_add_header(3http)
---
<h1>nng_http_req_add_header(3http)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_http_req_add_header - add HTTP request header</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span class="tok-cp">#include</span> <span class="tok-cpf"><nng/nng.h></span>
<span class="tok-cp">#include</span> <span class="tok-cpf"><nng/supplemental/http/http.h></span>
<span class="tok-kt">int</span> <span class="tok-nf">nng_http_req_add_header</span><span class="tok-p">(</span><span class="tok-n">nng_http_req</span> <span class="tok-o">*</span><span class="tok-n">req</span><span class="tok-p">,</span> <span class="tok-k">const</span> <span class="tok-kt">char</span> <span class="tok-o">*</span><span class="tok-n">key</span><span class="tok-p">,</span>
<span class="tok-k">const</span> <span class="tok-kt">char</span> <span class="tok-o">*</span><span class="tok-n">val</span><span class="tok-p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_http_req_add_header()</code> adds an HTTP header for the request
<em>req</em> and the <em>key</em> to the <em>val</em>. The <em>key</em> and <em>val</em> are copied.</p>
</div>
<div class="paragraph">
<p>If a header with the value of <em>key</em> already exists, then a comma
and whitespace separate are appended to it, followed by <em>val</em>.</p>
</div>
<div class="paragraph">
<p>If no such header already exists, then one is created with the value <em>val</em>.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
The HTTP specification requires that duplicate headers be treated
identically to a single header with multiple comma-delimited values.
</td>
</tr>
</table>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
See <a href="nng_http_req_set_header.3http.html"><code>nng_http_req_set_header()</code></a> if
replacement of an existing header rather than appending to it is desired.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The value of <em>key</em> is case insensitive, and should not include the final
colon in an HTTP header.
For example, specifying <code>Host</code> or <code>hOSt</code> are
equivalent, whereas the value <code>Host:</code> is not a legal header key.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This function returns 0 on success, and non-zero otherwise.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="hdlist">
<table>
<tr>
<td class="hdlist1">
<code>NNG_ENOMEM</code>
</td>
<td class="hdlist2">
<p>Insufficient memory to perform the operation.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ENOTSUP</code>
</td>
<td class="hdlist2">
<p>No support for HTTP in the library.</p>
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_http_req_alloc.3http.html">nng_http_req_alloc(3http)</a>,
<a href="nng_http_req_del_header.3http.html">nng_http_req_del_header(3http)</a>,
<a href="nng_http_req_get_header.3http.html">nng_http_req_get_header(3http)</a>,
<a href="nng_http_req_set_header.3http.html">nng_http_req_set_header(3http)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>
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