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112 lines
4.0 KiB
Groff
112 lines
4.0 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_PROXY.md
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.TH CURLOPT_PROXY 3 "March 15 2024" 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 transfers with this easy handle. The parameter
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should be a char * to a null\-terminated string holding the hostname 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\(aqs port number may optionally (but discouraged) be specified
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with the separate option \fICURLOPT_PROXYPORT(3)\fP. If not specified, libcurl
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defaults to 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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.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 uses 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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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 transparently converts
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operations to HTTP even if you specify an FTP URL etc. This may have an impact
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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) explicitly disables the use
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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 uses the specified proxy
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for that URL scheme. For an "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 environment
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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 hostname 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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int main(void)
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{
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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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}
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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_HTTPPROXYTUNNEL (3),
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.BR CURLOPT_PRE_PROXY (3),
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.BR CURLOPT_PROXYPORT (3),
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.BR CURLOPT_PROXYTYPE (3)
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