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curldown is this new file format for libcurl man pages. It is markdown inspired with differences: - Each file has a set of leading headers with meta-data - Supports a small subset of markdown - Uses .md file extensions for editors/IDE/GitHub to treat them nicely - Generates man pages very similar to the previous ones - Generates man pages that still convert nicely to HTML on the website - Detects and highlights mentions of curl symbols automatically (when their man page section is specified) tools: - cd2nroff: converts from curldown to nroff man page - nroff2cd: convert an (old) nroff man page to curldown - cdall: convert many nroff pages to curldown versions - cd2cd: verifies and updates a curldown to latest curldown This setup generates .3 versions of all the curldown versions at build time. CI: Since the documentation is now technically markdown in the eyes of many things, the CI runs many more tests and checks on this documentation, including proselint, link checkers and tests that make sure we capitalize the first letter after a period... Closes #12730
75 lines
1.8 KiB
Markdown
75 lines
1.8 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel.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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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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# PROTOCOLS
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All network 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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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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