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After this patch `://` schemes are lowercase and enclosed in backticks. Also: - docs/libcurl/libcurl-multi.md: drop a stray C code fence. - docs/libcurl/libcurl-tutorial.md: replace single/double quotes with Markdown markup where applicable. Ref: #21646 Closes #21674
90 lines
2.5 KiB
Markdown
90 lines
2.5 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_PRE_PROXY
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HTTPPROXYTUNNEL (3)
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- CURLOPT_PROXY (3)
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Protocol:
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- All
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Added-in: 7.52.0
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---
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# NAME
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CURLOPT_PRE_PROXY - pre-proxy host to use
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRE_PROXY, char *preproxy);
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~~~
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# DESCRIPTION
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Set the *preproxy* to use for the upcoming request. The parameter should be a
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char * to a null-terminated string holding the hostname or dotted numerical IP
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address. A numerical IPv6 address must be written within [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's port number may optionally be specified with the separate
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option CURLOPT_PROXYPORT(3). If not specified, libcurl defaults to using
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port 1080 for proxies.
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A pre proxy is a SOCKS proxy that curl connects to before it connects to the
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HTTP(S) proxy specified in the CURLOPT_PROXY(3) option. The pre proxy
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can only be a SOCKS proxy.
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The pre proxy string should be prefixed with `[scheme]://` to specify which
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kind of socks is used. Use `socks4://`, `socks4a://`, `socks5://` or
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`socks5h://` (the last one to enable socks5 and asking the proxy to do the
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resolving, also known as *CURLPROXY_SOCKS5_HOSTNAME* type) to request the
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specific SOCKS version to be used. Otherwise SOCKS4 is used as default.
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Setting the pre proxy string to "" (an empty string) explicitly disables the
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use of a pre proxy.
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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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The application does not have to keep the string around after setting this
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option.
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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to disable its use again.
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# DEFAULT
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NULL
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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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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CURLcode result;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/file.txt");
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curl_easy_setopt(curl, CURLOPT_PRE_PROXY, "socks4://socks-proxy:1080");
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curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy:80");
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result = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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