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---
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<title>nng_http_conn_transact(3http)</title>
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<h1>nng_http_conn_transact(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_transact - perform one HTTP transaction on 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_transact</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_http_req</span> <span class="tok-o">*</span><span class="tok-n">req</span><span class="tok-p">,</span>
<span class="tok-n">nng_http_res</span> <span class="tok-o">*</span><span class="tok-n">res</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_transact()</code> function is used to perform a complete
HTTP exchange over the connection <em>conn</em>, sending the request <em>req</em>
(and attached body data) to the remote server, and reading the response
<em>res</em>.
The entire response is read, including any associated body, which can
subsequently be obtained using
<a href="nng_http_res_get_data.3http.html"><code>nng_http_res_get_data()</code></a>.</p>
</div>
<div class="paragraph">
<p>This function is intended to make creation of client applications easier,
by performing multiple asynchronous operations required to complete an
entire HTTP transaction.</p>
</div>
<div class="paragraph">
<p>If an error occurs, the caller should close <em>conn</em> with
<a href="nng_http_conn_close.3http.html"><code>nng_http_conn_close()</code></a>, as it may not
necessarily be usable with other transactions.</p>
</div>
<div class="paragraph">
<p>A similar function,
<a href="nng_http_client_transact.3http.html"><code>nng_http_client_transact()</code></a>,
exists.
That function behaves similarily, but creates a connection on demand
for the transaction, and disposes of it when finished.</p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
If the remote server tries to send an extremely large buffer,
then a corresponding allocation will be made, which can lead to denial
of service attacks.
Client applications should take care to use this only with reasonably
trust-worthy servers.
</td>
</tr>
</table>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
A given connection <em>conn</em> should be used with only one
operation or transaction at a time as HTTP/1.1 has no support for
request interleaving.
</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>
</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_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_EPROTO</code>
</td>
<td class="hdlist2">
<p>An HTTP protocol error occurred.</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_result.3.html">nng_aio_result(3)</a>,
<a href="nng_strerror.3.html">nng_strerror(3)</a>,
<a href="nng_http_client_connect.3http.html">nng_http_client_connect(3http)</a>,
<a href="nng_http_client_transact.3http.html">nng_http_client_transact(3http)</a>,
<a href="nng_http_conn_read_res.3http.html">nng_http_conn_read_res(3http)</a>,
<a href="nng_http_conn_read_all.3http.html">nng_http_conn_read_all(3http)</a>,
<a href="nng_http_conn_write_req.3http.html">nng_http_conn_write_req(3http)</a>,
<a href="nng_http_res_get_data.3http.html">nng_http_res_get_data(3http)</a>,
<a href="nng.7.html">nng(7)</a></p>
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