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Daniel Stenberg e3fe020089

docs/libcurl: generate PROTOCOLS from meta-data

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

2024-03-23 18:13:03 +01:00

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

curl

CURLOPT_SUPPRESS_CONNECT_HEADERS

libcurl

CURLOPT_HEADER (3)

CURLOPT_HTTPPROXYTUNNEL (3)

CURLOPT_PROXY (3)

All

NAME

CURLOPT_SUPPRESS_CONNECT_HEADERS - suppress proxy CONNECT response headers

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SUPPRESS_CONNECT_HEADERS, long onoff);

DESCRIPTION

When CURLOPT_HTTPPROXYTUNNEL(3) is used and a CONNECT request is made, suppress proxy CONNECT response headers from the user callback functions CURLOPT_HEADERFUNCTION(3) and CURLOPT_WRITEFUNCTION(3).

Proxy CONNECT response headers can complicate header processing since it is essentially a separate set of headers. You can enable this option to suppress those headers.

For example let's assume an HTTPS URL is to be retrieved via CONNECT. On success there would normally be two sets of headers, and each header line sent to the header function and/or the write function. The data given to the callbacks would look like this:

HTTP/1.1 200 Connection established
{headers}
...

HTTP/1.1 200 OK
Content-Type: application/json
{headers}
...

{body}
...

However by enabling this option the CONNECT response headers are suppressed, so the data given to the callbacks would look like this:

HTTP/1.1 200 OK
Content-Type: application/json
{headers}
...

{body}
...

DEFAULT

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    curl_easy_setopt(curl, CURLOPT_HEADER, 1L);
    curl_easy_setopt(curl, CURLOPT_PROXY, "http://foo:3128");
    curl_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
    curl_easy_setopt(curl, CURLOPT_SUPPRESS_CONNECT_HEADERS, 1L);

    curl_easy_perform(curl);

    /* always cleanup */
    curl_easy_cleanup(curl);
  }
}

AVAILABILITY

Added in 7.54.0

RETURN VALUE

CURLE_OK or an error such as CURLE_UNKNOWN_OPTION.

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