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deps/curl/docs/libcurl/opts/CURLOPT_PRE_PROXY.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_PRE_PROXY
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_HTTPPROXYTUNNEL (3)
+  - CURLOPT_PROXY (3)
+---
+
+# NAME
+
+CURLOPT_PRE_PROXY - pre-proxy host to use
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRE_PROXY, char *preproxy);
+~~~
+
+# DESCRIPTION
+
+Set the *preproxy* to use for the upcoming request. The parameter should be a
+char * to a null-terminated string holding the hostname 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 defaults to using
+port 1080 for proxies.
+
+A pre proxy is a SOCKS proxy that curl connects to before it connects to the
+HTTP(S) proxy specified in the CURLOPT_PROXY(3) option. The pre proxy
+can only be a SOCKS proxy.
+
+The pre proxy string should be prefixed with [scheme]:// to specify which kind
+of socks is used. Use socks4://, socks4a://, socks5:// or socks5h:// (the last
+one to enable socks5 and asking the proxy to do the resolving, also known as
+*CURLPROXY_SOCKS5_HOSTNAME* type) to request the specific SOCKS version to
+be used. Otherwise SOCKS4 is used as default.
+
+Setting the pre proxy string to "" (an empty string) explicitly disables the
+use of a pre proxy.
+
+The application does not have to keep the string around after setting this
+option.
+
+# DEFAULT
+
+Default is NULL, meaning no pre proxy is used.
+
+When you set a hostname to use, do not assume that there is any particular
+single port number used widely for proxies. Specify it!
+
+# PROTOCOLS
+
+All except file://. Note that some protocols do not work well over proxy.
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/file.txt");
+    curl_easy_setopt(curl, CURLOPT_PRE_PROXY, "socks4://socks-proxy:1080");
+    curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy:80");
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.52.0
+
+# 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.