curl/docs/libcurl/opts/CURLOPT_HAPROXYPROTOCOL.md
Daniel Stenberg eefcc1bda4
docs: introduce "curldown" for libcurl man page format
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
2024-01-23 00:29:02 +01:00

64 lines
1.2 KiB
Markdown

---
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
SPDX-License-Identifier: curl
Title: CURLOPT_HAPROXYPROTOCOL
Section: 3
Source: libcurl
See-also:
- CURLOPT_PROXY (3)
---
# NAME
CURLOPT_HAPROXYPROTOCOL - send HAProxy PROXY protocol v1 header
# SYNOPSIS
~~~c
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HAPROXYPROTOCOL,
long haproxy_protocol);
~~~
# DESCRIPTION
A long parameter set to 1 tells the library to send an HAProxy PROXY
protocol v1 header at beginning of the connection. The default action is not to
send this header.
This option is primarily useful when sending test requests to a service that
expects this header.
Most applications do not need this option.
# DEFAULT
0, do not send any HAProxy PROXY protocol header
# PROTOCOLS
HTTP
# EXAMPLE
~~~c
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode ret;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_HAPROXYPROTOCOL, 1L);
ret = curl_easy_perform(curl);
}
}
~~~
# AVAILABILITY
Along with HTTP. Added in 7.60.0.
# RETURN VALUE
Returns CURLE_OK if HTTP is enabled, and CURLE_UNKNOWN_OPTION if not.