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---
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---
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<h1>nng_http_conn_write_all(3http) Manual Page</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_synopsis">SYNOPSIS</a></li>
<li><a href="#_description">DESCRIPTION</a></li>
<li><a href="#_return_values">RETURN VALUES</a></li>
<li><a href="#_errors">ERRORS</a></li>
<li><a href="#_see_also">SEE ALSO</a></li>
</ul>
</div>
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<p>nng_http_conn_write_all - write all to HTTP connection</p>
</div>
</div>
<div id="content">
<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></span><span class="tok-cp">#include</span> <span class="tok-cpf"><nng/nng.h></span><span class="tok-cp"></span>
<span class="tok-cp">#include</span> <span class="tok-cpf"><nng/supplemental/http/http.h></span><span class="tok-cp"></span>
<span class="tok-kt">void</span> <span class="tok-nf">nng_http_conn_write_all</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_all()</code> function starts an asynchronous write to the
HTTP connection <em>conn</em>, into 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 only when the entire amount of data
requested has been written, or an error has occurred.
If the operation completes successfully, then the entire requested data has
been written.</p>
</div>
<div class="paragraph">
<p>It is still possible for a partial write to complete in the event of an error.
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">
The main purpose for this function is to facilitate writing HTTP
body content.
</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">
Usually an HTTP request or response will have been written immediately
prior to this with <a href="nng_http_conn_write_req.3http.html"><code>http_conn_write_req()</code></a> or
<a href="nng_http_conn_write_res.3http.html"><code>http_conn_write_res()</code></a>.
In that case the request or response should have also contained
an <code>Content-Length</code> header, and possibly a <code>Content-Type</code> header.
</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">
An easier solution to sending HTTP content data, is to include the
content with the request or reply using a function like
<a href="nng_http_req_copy_data.3http.html"><code>nng_http_req_copy_data()</code></a>.
In that case, the body data will be written automatically by the
<a href="nng_http_conn_write_req.3http.html"><code>http_conn_write_req()</code></a> or
<a href="nng_http_conn_write_req.3http.html"><code>http_conn_write_res()</code></a> 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.3http.html">nng_http_conn_write(3http)</a>,
<a href="nng_http_conn_write_req.3http.html">http_conn_write_req(3http)</a>,
<a href="nng_http_conn_write_res.3http.html">http_conn_write_res(3http)</a>,
<a href="nng_http_req_copy_data.3http.html">nng_http_req_copy_data(3http)</a>,
<a href="nng_http_req_set_data.3http.html">nng_http_req_set_data(3http)</a>,
<a href="nng_http_res_copy_data.3http.html">nng_http_res_copy_data(3http)</a>,
<a href="nng_http_res_set_data.3http.html">nng_http_res_set_data(3http)</a>,
<a href="nng_strerror.3.html">nng_strerror(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
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