77 lines
2.6 KiB
Groff
77 lines
2.6 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 CURLOPT_HEADER 3 "April 26, 2023" "ibcurl 8.3.0" libcurl
|
|
|
|
.SH NAME
|
|
CURLOPT_HEADER \- pass headers to the data stream
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADER, long onoff);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
Pass the long value \fIonoff\fP set to 1 to ask libcurl to include the headers
|
|
in the write callback (\fICURLOPT_WRITEFUNCTION(3)\fP). This option is
|
|
relevant for protocols that actually have headers or other meta-data (like
|
|
HTTP and FTP).
|
|
|
|
When asking to get the headers passed to the same callback as the body, it is
|
|
not possible to accurately separate them again without detailed knowledge
|
|
about the protocol in use.
|
|
|
|
Further: the \fICURLOPT_WRITEFUNCTION(3)\fP callback is limited to only ever
|
|
get a maximum of \fICURL_MAX_WRITE_SIZE\fP bytes passed to it (16KB), while a
|
|
header can be longer and the \fICURLOPT_HEADERFUNCTION(3)\fP supports getting
|
|
called with headers up to \fICURL_MAX_HTTP_HEADER\fP bytes big (100KB).
|
|
|
|
It is often better to use \fICURLOPT_HEADERFUNCTION(3)\fP to get the header
|
|
data separately.
|
|
|
|
While named confusingly similar, \fICURLOPT_HTTPHEADER(3)\fP is used to set
|
|
custom HTTP headers!
|
|
.SH DEFAULT
|
|
0
|
|
.SH PROTOCOLS
|
|
Most
|
|
.SH EXAMPLE
|
|
.nf
|
|
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_perform(curl);
|
|
}
|
|
.fi
|
|
.SH AVAILABILITY
|
|
Provided in all libcurl versions.
|
|
.SH RETURN VALUE
|
|
Returns CURLE_OK.
|
|
.SH "SEE ALSO"
|
|
.BR CURLOPT_HEADERFUNCTION "(3), "
|
|
.BR CURLOPT_HTTPHEADER "(3), "
|