85 lines
3.3 KiB
Groff
85 lines
3.3 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_PRE_PROXY 3 "16 Nov 2016" libcurl libcurl
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.SH NAME
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CURLOPT_PRE_PROXY \- pre-proxy host to use
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRE_PROXY, char *preproxy);
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.fi
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.SH DESCRIPTION
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Set the \fIpreproxy\fP to use for the upcoming request. The parameter
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should be a char * to a null-terminated string holding the host name or dotted
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numerical IP address. A numerical IPv6 address must be written within
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[brackets].
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To specify port number in this string, append :[port] to the end of the host
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name. The proxy's port number may optionally be specified with the separate
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option \fICURLOPT_PROXYPORT(3)\fP. If not specified, libcurl defaults to using
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port 1080 for proxies.
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A pre proxy is a SOCKS proxy that curl connects to before it connects to the
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HTTP(S) proxy specified in the \fICURLOPT_PROXY(3)\fP option. The pre proxy
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can only be a SOCKS proxy.
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The pre proxy string should be prefixed with [scheme]:// to specify which kind
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of socks is used. Use socks4://, socks4a://, socks5:// or socks5h:// (the last
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one to enable socks5 and asking the proxy to do the resolving, also known as
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\fICURLPROXY_SOCKS5_HOSTNAME\fP type) to request the specific SOCKS version to
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be used. Otherwise SOCKS4 is used as default.
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Setting the pre proxy string to "" (an empty string) explicitly disables the
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use of a pre proxy.
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The application does not have to keep the string around after setting this
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option.
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.SH DEFAULT
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Default is NULL, meaning no pre proxy is used.
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When you set a host name to use, do not assume that there is any particular
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single port number used widely for proxies. Specify it!
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.SH PROTOCOLS
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All except file://. Note that some protocols do not work well over proxy.
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/file.txt");
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curl_easy_setopt(curl, CURLOPT_PRE_PROXY, "socks4://socks-proxy:1080");
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curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy:80");
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.52.0
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.SH RETURN VALUE
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Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not, or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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.SH "SEE ALSO"
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.BR CURLOPT_PROXY (3),
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.BR CURLOPT_HTTPPROXYTUNNEL (3)
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