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e3fe020089
Remove the PROTOCOLS section from the source files completely and instead generate them based on the header data in the curldown files. It also generates TLS backend information for options marked for TLS as protocol. Closes #13175
74 lines
1.8 KiB
Markdown
74 lines
1.8 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_HTTPPROXYTUNNEL
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Section: 3
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Source: libcurl
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Protocol:
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- All
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See-also:
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- CURLOPT_PROXY (3)
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- CURLOPT_PROXYPORT (3)
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- CURLOPT_PROXYTYPE (3)
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---
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# NAME
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CURLOPT_HTTPPROXYTUNNEL - tunnel through HTTP proxy
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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_HTTPPROXYTUNNEL, long tunnel);
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~~~
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# DESCRIPTION
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Set the **tunnel** parameter to 1L to make libcurl tunnel all operations
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through the HTTP proxy (set with CURLOPT_PROXY(3)). There is a big
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difference between using a proxy and to tunnel through it.
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Tunneling means that an HTTP CONNECT request is sent to the proxy, asking it
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to connect to a remote host on a specific port number and then the traffic is
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just passed through the proxy. Proxies tend to white-list specific port numbers
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it allows CONNECT requests to and often only port 80 and 443 are allowed.
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To suppress proxy CONNECT response headers from user callbacks use
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CURLOPT_SUPPRESS_CONNECT_HEADERS(3).
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HTTP proxies can generally only speak HTTP (for obvious reasons), which makes
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libcurl convert non-HTTP requests to HTTP when using an HTTP proxy without
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this tunnel option set. For example, asking for an FTP URL and specifying an
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HTTP proxy makes libcurl send an FTP URL in an HTTP GET request to the
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proxy. By instead tunneling through the proxy, you avoid that conversion (that
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rarely works through the proxy anyway).
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# DEFAULT
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0
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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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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
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curl_easy_setopt(curl, CURLOPT_PROXY, "http://127.0.0.1:80");
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curl_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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Always
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# RETURN VALUE
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Returns CURLE_OK
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