| Server IP : 88.222.222.107 / Your IP : 216.73.216.122 Web Server : LiteSpeed System : Linux id-dci-web1986.main-hosting.eu 5.14.0-611.26.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jan 29 05:24:47 EST 2026 x86_64 User : u686484674 ( 686484674) PHP Version : 8.0.30 Disable Function : system, exec, shell_exec, passthru, mysql_list_dbs, ini_alter, dl, symlink, link, chgrp, leak, popen, apache_child_terminate, virtual, mb_send_mail MySQL : OFF | cURL : ON | WGET : ON | Perl : OFF | Python : OFF | Sudo : OFF | Pkexec : OFF Directory : /proc/self/root/opt/./alt/curlssl30/usr/share/man/man3/ |
Upload File : |
.\" generated by cd2nroff 0.1 from CURLOPT_HEADEROPT.md
.TH CURLOPT_HEADEROPT 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_HEADEROPT \- send HTTP headers to both proxy and host or separately
.SH SYNOPSIS
.nf
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HEADEROPT, long bitmask);
.fi
.SH DESCRIPTION
Pass a long that is a bitmask of options of how to deal with headers. The two
mutually exclusive options are:
\fBCURLHEADER_UNIFIED\fP \- the headers specified in
\fICURLOPT_HTTPHEADER(3)\fP are used in requests both to servers and
proxies. With this option enabled, \fICURLOPT_PROXYHEADER(3)\fP does not have
any effect.
\fBCURLHEADER_SEPARATE\fP \- makes \fICURLOPT_HTTPHEADER(3)\fP headers only get
sent to a server and not to a proxy. Proxy headers must be set with
\fICURLOPT_PROXYHEADER(3)\fP to get used. Note that if a non\-CONNECT request
is sent to a proxy, libcurl sends both server headers and proxy headers. When
doing CONNECT, libcurl sends \fICURLOPT_PROXYHEADER(3)\fP headers only to the
proxy and then \fICURLOPT_HTTPHEADER(3)\fP headers only to the server.
.SH DEFAULT
CURLHEADER_SEPARATE (changed in 7.42.1, used CURLHEADER_UNIFIED before then)
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
CURLcode ret;
struct curl_slist *list;
list = curl_slist_append(NULL, "Shoesize: 10");
list = curl_slist_append(list, "Accept:");
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
curl_easy_setopt(curl, CURLOPT_PROXY, "http://localhost:8080");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
/* HTTPS over a proxy makes a separate CONNECT to the proxy, so tell
libcurl to not send the custom headers to the proxy. Keep them
separate. */
curl_easy_setopt(curl, CURLOPT_HEADEROPT, (long)CURLHEADER_SEPARATE);
ret = curl_easy_perform(curl);
curl_slist_free_all(list);
curl_easy_cleanup(curl);
}
}
.fi
.SH AVAILABILITY
Added in curl 7.37.0
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_HTTPHEADER (3),
.BR CURLOPT_PROXYHEADER (3)