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