43 lines
7.7 KiB
HTML
43 lines
7.7 KiB
HTML
<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>ne_request_create</title><link rel="stylesheet" href="../manual.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.68.1"><link rel="start" href="index.html" title="neon HTTP/WebDAV client library"><link rel="up" href="ref.html" title="neon API reference"><link rel="prev" href="refsess.html" title="ne_session_create"><link rel="next" href="refreqhdr.html" title="ne_add_request_header"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">ne_request_create</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="refsess.html">Prev</a> </td><th width="60%" align="center">neon API reference</th><td width="20%" align="right"> <a accesskey="n" href="refreqhdr.html">Next</a></td></tr></table><hr></div><div class="refentry" lang="en"><a name="refreq"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ne_request_create, ne_request_dispatch, ne_request_destroy — low-level HTTP request handling</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include <ne_request.h></pre><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="funcprototype"><code><code xmlns="" class="funcdef">ne_request *<b class="fsfunc">ne_request_create</b>(</code>ne_session *<var xmlns="" class="pdparam">session</var>, const char *<var xmlns="" class="pdparam">method</var>, const char *<var xmlns="" class="pdparam">path</var><code xmlns="">)</code>;</code></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="funcprototype"><code><code xmlns="" class="funcdef">int <b class="fsfunc">ne_request_dispatch</b>(</code>ne_request *<var xmlns="" class="pdparam">req</var><code xmlns="">)</code>;</code></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="funcprototype"><code><code xmlns="" class="funcdef">void <b class="fsfunc">ne_request_destroy</b>(</code>ne_request *<var xmlns="" class="pdparam">req</var><code xmlns="">)</code>;</code></div></div></div><div class="refsect1" lang="en"><a name="id2935337"></a><h2>Description</h2><p>An HTTP request, represented by the
|
||
<em class="type">ne_request</em> type, specifies that some operation is to be
|
||
performed on some resource. The
|
||
<code class="function">ne_request_create</code> function creates a request
|
||
object, specifying the operation in the <code class="parameter">method</code>
|
||
parameter. The location of the resource is determined by the server in
|
||
use for the session given by the <code class="parameter">sess</code>
|
||
parameter, combined with the <code class="parameter">path</code> parameter.</p><p>The <code class="parameter">path</code> string used must conform to the
|
||
<code class="literal">abs_path</code> definition given in RFC2396, with an
|
||
optional "?query" part, and must be URI-escaped by the caller (for
|
||
instance, using <code class="function">ne_path_escape</code>). If the string
|
||
comes from an untrusted source, failure to perform URI-escaping
|
||
results in a security vulnerability.</p><p>To dispatch a request, and process the response, the
|
||
<code class="function">ne_request_dispatch</code> function can be used. An
|
||
alternative is to use the (more complex, but more flexible)
|
||
combination of the <code class="function">ne_begin_request</code>,
|
||
<code class="function">ne_end_request</code>, and
|
||
<code class="function">ne_read_response_block</code> functions; see
|
||
<code class="function">ne_begin_request</code>.</p><p>To add extra headers in the request, the functions <a href="refreqhdr.html#ne_add_request_header">ne_add_request_header</a> and <a href="refreqhdr.html#ne_print_request_header">ne_print_request_header</a> can be used. To include a message
|
||
body with the request, one of the functions
|
||
<code class="function">ne_set_request_body_buffer</code>, <a href="refreqbody.html#ne_set_request_body_fd">ne_set_request_body_fd</a>, or
|
||
<code class="function">ne_set_request_body_provider</code> can be used.</p><p>The return value of
|
||
<code class="function">ne_request_dispatch</code> indicates merely whether the
|
||
request was sent and the response read successfully. To discover the
|
||
result of the operation, <a href="refgetst.html#ne_get_status">ne_get_status</a>, along with
|
||
any processing of the response headers and message body.</p><p>A request can only be dispatched once: calling
|
||
<code class="function">ne_request_dispatch</code> more than once on a single
|
||
<em class="type">ne_request</em> object produces undefined behaviour. Once all
|
||
processing associated with the request object is complete, use the
|
||
<code class="function">ne_request_destroy</code> function to destroy the
|
||
resources associated with it. Any subsequent use of the request
|
||
object produces undefined behaviour.</p></div><div class="refsect1" lang="en"><a name="id2936417"></a><h2>Return value</h2><p>The <code class="function">ne_request_create</code> function
|
||
returns a pointer to a request object (and never <code class="literal">NULL</code>).</p><p>The <code class="function">ne_request_dispatch</code> function
|
||
returns zero if the request was dispatched successfully, and a
|
||
non-zero error code otherwise.</p></div><div class="refsect1" lang="en"><a name="id2936456"></a><h2>Errors</h2><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><span class="term"><span class="errorcode">NE_ERROR</span></span></td><td>Request failed (see session error string)</td></tr><tr><td><span class="term"><span class="errorcode">NE_LOOKUP</span></span></td><td>The DNS lookup for the server (or proxy server) failed.</td></tr><tr><td><span class="term"><span class="errorcode">NE_AUTH</span></span></td><td>Authentication failed on the server.</td></tr><tr><td><span class="term"><span class="errorcode">NE_PROXYAUTH</span></span></td><td>Authentication failed on the proxy server.</td></tr><tr><td><span class="term"><span class="errorcode">NE_CONNECT</span></span></td><td>A connection to the server could not be established.</td></tr><tr><td><span class="term"><span class="errorcode">NE_TIMEOUT</span></span></td><td>A timeout occurred while waiting for the server to respond.</td></tr></tbody></table></div></div><div class="refsect1" lang="en"><a name="id2936562"></a><h2>Example</h2><p>An example of applying a <code class="literal">MKCOL</code>
|
||
operation to the resource at the location
|
||
<code class="literal">http://www.example.com/foo/bar/</code>:</p><pre class="programlisting">ne_session *sess = ne_session_create("http", "www.example.com", 80);
|
||
ne_request *req = ne_request_create(sess, "MKCOL", "/foo/bar/");
|
||
if (ne_request_dispatch(req)) {
|
||
printf("Request failed: %s\n", ne_get_error(sess));
|
||
}
|
||
ne_request_destroy(req);</pre></div><div class="refsect1" lang="en"><a name="id2936595"></a><h2>See also</h2><p><a href="referr.html#ne_get_error">ne_get_error</a>, <a href="referr.html#ne_set_error">ne_set_error</a>, <a href="refgetst.html#ne_get_status">ne_get_status</a>, <a href="refreqhdr.html#ne_add_request_header">ne_add_request_header</a>, <a href="refreqbody.html#ne_set_request_body_buffer">ne_set_request_body_buffer</a>.</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="refsess.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ref.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="refreqhdr.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ne_session_create </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ne_add_request_header</td></tr></table></div></body></html>
|