98 lines
4.1 KiB
Groff
98 lines
4.1 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at https://curl.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" * SPDX-License-Identifier: curl
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.TH curl_easy_nextheader 3 "13 March 2022" "libcurl" "libcurl"
|
|
.SH NAME
|
|
curl_easy_nextheader - get the next HTTP header
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
struct curl_header *curl_easy_nextheader(CURL *easy,
|
|
unsigned int origin,
|
|
int request,
|
|
struct curl_header *prev);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
This function lets an application iterate over all previously received HTTP
|
|
headers.
|
|
|
|
The \fIorigin\fP argument is for specifying which headers to receive, as a
|
|
single HTTP transfer might provide headers from several different places and
|
|
they may then have different importance to the user and headers using the same
|
|
name might be used. The \fIorigin\fP is a bitmask for what header sources you
|
|
want. See the \fIcurl_easy_header(3)\fP man page for the origin descriptions.
|
|
|
|
The \fIrequest\fP argument tells libcurl from which request you want headers
|
|
from. A single transfer might consist of a series of HTTP requests and this
|
|
argument lets you specify which particular individual request you want the
|
|
headers from. 0 being the first request and then the number increases for
|
|
further redirects or when multi-state authentication is used. Passing in -1 is
|
|
a shortcut to "the last" request in the series, independently of the actual
|
|
amount of requests used.
|
|
|
|
It is suggested that you pass in the same \fBorigin\fP and \fBrequest\fP when
|
|
iterating over a range of headers as changing the value mid-loop might give
|
|
you unexpected results.
|
|
|
|
If \fIprev\fP is NULL, this function returns a pointer to the first header
|
|
stored within the given scope (origin + request).
|
|
|
|
If \fIprev\fP is a pointer to a previously returned header struct,
|
|
\fIcurl_easy_nextheader(3)\fP returns a pointer the next header stored within
|
|
the given scope. This way, an application can iterate over all available
|
|
headers.
|
|
|
|
The memory for the struct this points to, is owned and managed by libcurl and
|
|
is associated with the easy handle. Applications must copy the data if they
|
|
want it to survive subsequent API calls or the life-time of the easy handle.
|
|
.SH EXAMPLE
|
|
.nf
|
|
struct curl_header *prev = NULL;
|
|
struct curl_header *h;
|
|
|
|
/* extract the normal headers from the first request */
|
|
while((h = curl_easy_nextheader(easy, CURLH_HEADER, 0, prev))) {
|
|
printf("%s: %s\\n", h->name, h->value);
|
|
prev = h;
|
|
}
|
|
|
|
/* extract the normal headers + 1xx + trailers from the last request */
|
|
unsigned int origin = CURLH_HEADER| CURLH_1XX | CURLH_TRAILER;
|
|
while((h = curl_easy_nextheader(easy, origin, -1, prev))) {
|
|
printf("%s: %s\\n", h->name, h->value);
|
|
prev = h;
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Added in 7.83.0. Officially supported since 7.84.0.
|
|
.SH RETURN VALUE
|
|
This function returns the next header, or NULL when there are no more
|
|
(matching) headers or an error occurred.
|
|
|
|
If this function returns NULL when \fIprev\fP was set to NULL, then there are
|
|
no headers available within the scope to return.
|
|
.SH "SEE ALSO"
|
|
.BR curl_easy_header (3),
|
|
.BR curl_easy_perform (3)
|