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---
version: v1.7.0
layout: manpage_v2
title: nng_http_conn_write(3http)
---
<h1>nng_http_conn_write(3http)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_http_conn_write - write to HTTP connection</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">void</span> <span class="tok-nf">nng_http_conn_write</span><span class="tok-p">(</span><span class="tok-n">nng_http_conn</span> <span class="tok-o">*</span><span class="tok-n">conn</span><span class="tok-p">,</span> <span class="tok-n">nng_aio</span> <span class="tok-o">*</span><span class="tok-n">aio</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_conn_write()</code> function starts an asynchronous write to the
HTTP connection <em>conn</em> from the scatter/gather vector located in the
asynchronous I/O structure <em>aio</em>.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<i class="fa icon-note" title="Note"></i>
</td>
<td class="content">
The <a href="nng_aio_set_iov.3.html"><code>nng_aio_set_iov()</code></a> function must have been
called first, to set the scatter/gather vector for <em>aio</em>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>This function returns immediately, with no return value.
Completion of the operation is signaled via the <em>aio</em>, and the final
result may be obtained via <a href="nng_aio_result.3.html"><code>nng_aio_result()</code></a>.
That result will either be zero or an error code.</p>
</div>
<div class="paragraph">
<p>The I/O operation completes as soon as at least one byte has been
written, or an error has occurred.
Therefore, the number of bytes written may be less than requested.
The actual number of bytes written can be determined with
<a href="nng_aio_count.3.html"><code>nng_aio_count()</code></a>.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
This function is intended to facilitate uses cases that involve changing
the protocol from HTTP, such as WebSocket.
Most applications will never need to use this function.
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>None.</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_ECANCELED</code>
</td>
<td class="hdlist2">
<p>The operation was canceled.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ECLOSED</code>
</td>
<td class="hdlist2">
<p>The connection was closed.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ECONNRESET</code>
</td>
<td class="hdlist2">
<p>The peer closed the connection.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_EINVAL</code>
</td>
<td class="hdlist2">
<p>The <em>aio</em> does not contain a valid scatter/gather vector.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ENOMEM</code>
</td>
<td class="hdlist2">
<p>Insufficient free memory to perform the operation.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ENOTSUP</code>
</td>
<td class="hdlist2">
<p>HTTP operations are not supported.</p>
</td>
</tr>
<tr>
<td class="hdlist1">
<code>NNG_ETIMEDOUT</code>
</td>
<td class="hdlist2">
<p>Timeout waiting for data from the connection.</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_aio_alloc.3.html">nng_aio_alloc(3)</a>,
<a href="nng_aio_count.3.html">nng_aio_count(3)</a>,
<a href="nng_aio_result.3.html">nng_aio_result(3)</a>,
<a href="nng_aio_set_iov.3.html">nng_aio_set_iov(3)</a>,
<a href="nng_http_client_connect.3http.html">nng_http_client_connect(3http)</a>,
<a href="nng_http_conn_write_all.3http.html">nng_http_conn_write_all(3http)</a>,
<a href="nng_http_handler_alloc.3http.html">nng_http_handler_alloc(3http)</a>,
<a href="nng_strerror.3.html">nng_strerror(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>
|
