CURLOPT_PROXY(3) curl_easy_setopt options 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 the upcoming request. 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 be specified with the
separate option CURLOPT_PROXYPORT(3). If not specified, libcurl will
default 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, GnuTLS and
NSS)
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 will transpar-
ently convert 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 acti-
vated with CURLOPT_HTTPPROXYTUNNEL(3).
Setting the proxy string to "" (an empty string) will explicitly dis-
able 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 em-
bedded user + password.
The application does not have to keep the string around after setting
this option.
Environment variables
libcurl respects the proxy environment variables named http_proxy,
ftp_proxy, sftp_proxy etc. If set, libcurl will use the specified proxy
for that URL scheme. So for a "FTP://" URL, the ftp_proxy is consid-
ered. 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's any partic-
ular 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 re-
turn 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_PROXYPORT(3), CURLOPT_HTTPPROXYTUNNEL(3), CURLOPT_PROXYTYPE(3)
libcurl 7.81.0 November 26, 2021 CURLOPT_PROXY(3)
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