Set the proxy to use for the upcoming request. The parameter should be a char * to a zero 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. 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 Proxy. Default when no scheme or proxy type is specified.
HTTPS Proxy. (Added in 7.52.0 for OpenSSL, GnuTLS and NSS)
SOCKS4a Proxy. Proxy resolves URL hostname.
SOCKS5 Proxy. Proxy resolves URL hostname.
Without a scheme prefix, CURLOPT_PROXYTYPE can be used to specify which kind of proxy the string identifies.
When you tell the library to use a HTTP proxy, libcurl will transparently 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 and similar FTP specifics that don't work unless you tunnel through the HTTP proxy. Such tunneling is activated with CURLOPT_HTTPPROXYTUNNEL.
libcurl respects the environment variables http_proxy, ftp_proxy, all_proxy etc, if any of those are set. The CURLOPT_PROXY option does however override any possibly set environment variables.
Setting the proxy string to "" (an empty string) will explicitly disable 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.
Default is NULL, meaning no proxy is used.
Since 7.14.1 the proxy environment variable names can include the protocol scheme.
Since 7.21.7 the proxy string supports the socks protocols as "schemes".
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