75 lines
2.8 KiB
Groff
75 lines
2.8 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at https://curl.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" * SPDX-License-Identifier: curl
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLOPT_HTTPPROXYTUNNEL 3 "17 Jun 2014" libcurl libcurl
|
|
.SH NAME
|
|
CURLOPT_HTTPPROXYTUNNEL \- tunnel through HTTP proxy
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTPPROXYTUNNEL, long tunnel);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
Set the \fBtunnel\fP parameter to 1L to make libcurl tunnel all operations
|
|
through the HTTP proxy (set with \fICURLOPT_PROXY(3)\fP). There is a big
|
|
difference between using a proxy and to tunnel through it.
|
|
|
|
Tunneling means that an HTTP CONNECT request is sent to the proxy, asking it
|
|
to connect to a remote host on a specific port number and then the traffic is
|
|
just passed through the proxy. Proxies tend to white-list specific port numbers
|
|
it allows CONNECT requests to and often only port 80 and 443 are allowed.
|
|
|
|
To suppress proxy CONNECT response headers from user callbacks use
|
|
\fICURLOPT_SUPPRESS_CONNECT_HEADERS(3)\fP.
|
|
|
|
HTTP proxies can generally only speak HTTP (for obvious reasons), which makes
|
|
libcurl convert non-HTTP requests to HTTP when using an HTTP proxy without
|
|
this tunnel option set. For example, asking for an FTP URL and specifying an
|
|
HTTP proxy makes libcurl send an FTP URL in an HTTP GET request to the
|
|
proxy. By instead tunneling through the proxy, you avoid that conversion (that
|
|
rarely works through the proxy anyway).
|
|
.SH DEFAULT
|
|
0
|
|
.SH PROTOCOLS
|
|
All network protocols
|
|
.SH EXAMPLE
|
|
.nf
|
|
CURL *curl = curl_easy_init();
|
|
if(curl) {
|
|
curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
|
|
curl_easy_setopt(curl, CURLOPT_PROXY, "http://127.0.0.1:80");
|
|
curl_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
|
|
curl_easy_perform(curl);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Always
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_PROXY (3),
|
|
.BR CURLOPT_PROXYTYPE (3),
|
|
.BR CURLOPT_PROXYPORT (3)
|