x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
CURLOPT_PROXY(3) libcurl CURLOPT_PROXY(3)
NAME
CURLOPT_PROXY - proxy to use
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY, char *proxy);
DESCRIPTION
Set the proxy to use for transfers with this easy handle. The parameter
should be a char * to a null-terminated string holding the host name or
dotted numerical IP address. A numerical IPv6 address must be written
within [brackets].
To specify port number in this string, append :[port] to the end of the
host name. The proxy's port number may optionally (but discouraged) be
specified with the separate option CURLOPT_PROXYPORT(3). If not speci-
fied, libcurl defaults to using port 1080 for proxies.
The proxy string may be prefixed with [scheme]:// to specify which kind
of proxy is used.
http://
HTTP Proxy. Default when no scheme or proxy type is spec-
ified.
https://
HTTPS Proxy. (Added in 7.52.0 for OpenSSL and GnuTLS
Since 7.87.0, it also works for BearSSL, mbedTLS, rustls,
Schannel, Secure Transport and wolfSSL.)
This uses HTTP/1 by default. Setting CURLOPT_PROXYTYPE(3)
to CURLPROXY_HTTPS2 allows libcurl to negotiate using
HTTP/2 with proxy.
socks4://
SOCKS4 Proxy.
socks4a://
SOCKS4a Proxy. Proxy resolves URL hostname.
socks5://
SOCKS5 Proxy.
socks5h://
SOCKS5 Proxy. Proxy resolves URL hostname.
Without a scheme prefix, CURLOPT_PROXYTYPE(3) can be used to specify
which kind of proxy the string identifies.
When you tell the library to use an HTTP proxy, libcurl transparently
converts operations to HTTP even if you specify an FTP URL etc. This
may have an impact on what other features of the library you can use,
such as CURLOPT_QUOTE(3) and similar FTP specifics that do not work
unless you tunnel through the HTTP proxy. Such tunneling is activated
with CURLOPT_HTTPPROXYTUNNEL(3).
Setting the proxy string to "" (an empty string) explicitly disables
the use of a proxy, even if there is an environment variable set for
it.
A proxy host string can also include protocol scheme (http://) and
embedded user + password.
Unix domain sockets are supported for socks proxies since 7.84.0. Set
localhost for the host part. e.g. socks5h://local-
host/path/to/socket.sock
The application does not have to keep the string around after setting
this option.
When a proxy is used, the active FTP mode as set with CUROPT_FTP-
PORT(3), cannot be used.
Environment variables
libcurl respects the proxy environment variables named http_proxy,
ftp_proxy, sftp_proxy etc. If set, libcurl uses the specified proxy for
that URL scheme. So for a "FTP://" URL, the ftp_proxy is considered.
all_proxy is used if no protocol specific proxy was set.
If no_proxy (or NO_PROXY) is set, it is the exact equivalent of setting
the CURLOPT_NOPROXY(3) option.
The CURLOPT_PROXY(3) and CURLOPT_NOPROXY(3) options override environ-
ment variables.
DEFAULT
Default is NULL, meaning no proxy is used.
When you set a host name to use, do not assume that there is any par-
ticular single port number used widely for proxies. Specify it!
PROTOCOLS
All except file://. Note that some protocols do not work well over
proxy.
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/file.txt");
curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy:80");
curl_easy_perform(curl);
}
AVAILABILITY
Since 7.14.1 the proxy environment variable names can include the pro-
tocol scheme.
Since 7.21.7 the proxy string supports the socks protocols as
"schemes".
Since 7.50.2, unsupported schemes in proxy strings cause libcurl to
return error.
RETURN VALUE
Returns CURLE_OK if proxies are supported, CURLE_UNKNOWN_OPTION if not,
or CURLE_OUT_OF_MEMORY if there was insufficient heap space.
SEE ALSO
CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PRE_PROXY(3), CURLOPT_PROXYPORT(3),
CURLOPT_PROXYTYPE(3)
ibcurl 8.4.0 September 26, 2023 CURLOPT_PROXY(3)
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