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Daniel Stenberg b935fd4a07

docs: make each libcurl man specify protocol(s)

The mandatory header now has a mandatory list of protocols for which the
manpage is relevant.

Most man pages already has a "PROTOCOLS" section, but this introduces a
stricter way to specify the relevant protocols.

cd2nroff verifies that at least one protocol is mentioned (which can be
`*`).

This information is not used just yet, but A) the PROTOCOLS section can
now instead get generated and get a unified wording across all manpages
and B) this allows us to more reliably filter/search for protocol
specific manpages/options.

Closes #13166

2024-03-21 15:27:06 +01:00

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

curl

curl_pushheader_bynum

libcurl

CURLMOPT_PUSHFUNCTION (3)

curl_pushheader_byname (3)

HTTP

NAME

curl_pushheader_bynum - get a push header by index

SYNOPSIS

#include <curl/curl.h>

char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num);

DESCRIPTION

This is a function that is only functional within a CURLMOPT_PUSHFUNCTION(3) callback. It makes no sense to try to use it elsewhere and it has no function then.

It returns the value for the header field at the given index num, for the incoming server push request or NULL. The data pointed to is freed by libcurl when this callback returns. The returned pointer points to a "name:value" string that gets freed when this callback returns.

EXAMPLE

/* output all the incoming push request headers */
static int push_cb(CURL *parent,
                   CURL *easy,
                   size_t num_headers,
                   struct curl_pushheaders *headers,
                   void *clientp)
{
  int i = 0;
  char *field;
  do {
     field = curl_pushheader_bynum(headers, i);
     if(field)
       fprintf(stderr, "Push header: %s\n", field);
     i++;
  } while(field);
  return CURL_PUSH_OK; /* permission granted */
}

int main(void)
{
  CURLM *multi = curl_multi_init();
  curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_cb);
}

AVAILABILITY

Added in 7.44.0

RETURN VALUE

Returns a pointer to the header field content or NULL.

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