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132 lines
5.0 KiB
Groff
132 lines
5.0 KiB
Groff
.\" **************************************************************************
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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_PROXY 3 "17 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_PROXY \- proxy 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_PROXY, char *proxy);
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.fi
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.SH DESCRIPTION
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Set the \fIproxy\fP to use for the upcoming request. The parameter should be a
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char * to a null-terminated string holding the host name or dotted numerical
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IP address. A numerical IPv6 address must be written within [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 will default to
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using port 1080 for proxies.
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The proxy string may be prefixed with [scheme]:// to specify which kind of
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proxy is used.
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.RS
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.IP http://
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HTTP Proxy. Default when no scheme or proxy type is specified.
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.IP https://
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HTTPS Proxy. (Added in 7.52.0 for OpenSSL and GnuTLS Since 7.87.0, it
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also works for BearSSL, mbedTLS, rustls, Schannel, Secure Transport and
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wolfSSL.)
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This will use HTTP/1 by default. Setting \fICURLOPT_PROXYTYPE(3)\fP to
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\fBCURLPROXY_HTTPS2\fP allows libcurl to negotiate using HTTP/2 with proxy.
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.IP socks4://
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SOCKS4 Proxy.
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.IP socks4a://
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SOCKS4a Proxy. Proxy resolves URL hostname.
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.IP socks5://
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SOCKS5 Proxy.
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.IP socks5h://
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SOCKS5 Proxy. Proxy resolves URL hostname.
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.RE
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Without a scheme prefix, \fICURLOPT_PROXYTYPE(3)\fP can be used to specify
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which kind of proxy the string identifies.
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When you tell the library to use an HTTP proxy, libcurl will transparently
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convert operations to HTTP even if you specify an FTP URL etc. This may have
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an impact on what other features of the library you can use, such as
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\fICURLOPT_QUOTE(3)\fP and similar FTP specifics that do not work unless you
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tunnel through the HTTP proxy. Such tunneling is activated with
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\fICURLOPT_HTTPPROXYTUNNEL(3)\fP.
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Setting the proxy string to "" (an empty string) will explicitly disable the
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use of a proxy, even if there is an environment variable set for it.
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A proxy host string can also include protocol scheme (http://) and embedded
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user + password.
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Unix domain sockets are supported for socks proxies since 7.84.0. Set
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localhost for the host part. e.g. socks5h://localhost/path/to/socket.sock
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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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When a proxy is used, the active FTP mode as set with \fICUROPT_FTPPORT(3)\fP,
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cannot be used.
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.SH "Environment variables"
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libcurl respects the proxy environment variables named \fBhttp_proxy\fP,
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\fBftp_proxy\fP, \fBsftp_proxy\fP etc. If set, libcurl will use the specified
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proxy for that URL scheme. So for a "FTP://" URL, the \fBftp_proxy\fP is
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considered. \fBall_proxy\fP is used if no protocol specific proxy was set.
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If \fBno_proxy\fP (or \fBNO_PROXY\fP) is set, it is the exact equivalent of
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setting the \fICURLOPT_NOPROXY(3)\fP option.
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The \fICURLOPT_PROXY(3)\fP and \fICURLOPT_NOPROXY(3)\fP options override
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environment variables.
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.SH DEFAULT
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Default is NULL, meaning no proxy is used.
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When you set a host name to use, do not assume that there's 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_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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Since 7.14.1 the proxy environment variable names can include the protocol
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scheme.
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Since 7.21.7 the proxy string supports the socks protocols as "schemes".
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Since 7.50.2, unsupported schemes in proxy strings cause libcurl to return
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error.
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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_PROXYPORT "(3), " CURLOPT_HTTPPROXYTUNNEL "(3), "
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.BR CURLOPT_PROXYTYPE "(3)"
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