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.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2015, 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 http://curl.haxx.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.
.\" *
.\" **************************************************************************
.\"
.TH CURLOPT_HTTP_VERSION 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_HTTP_VERSION \- specify HTTP protocol version to use
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP_VERSION, long version);
.SH DESCRIPTION
Pass \fIversion\fP a long, set to one of the values described below. They ask
libcurl to use the specific HTTP versions. This is not sensible to do unless
you have a good reason. You have to set this option if you want to use
libcurl's HTTP/2 support.
Note that the HTTP version is just a request. libcurl will still prioritize to
re-use an existing connection so it might then re-use a connection using a
HTTP version you haven't asked for.
.IP CURL_HTTP_VERSION_NONE
We don't care about what version the library uses. libcurl will use whatever
it thinks fit.
.IP CURL_HTTP_VERSION_1_0
Enforce HTTP 1.0 requests.
.IP CURL_HTTP_VERSION_1_1
Enforce HTTP 1.1 requests.
.IP CURL_HTTP_VERSION_2_0
Attempt HTTP 2 requests. libcurl will fall back to HTTP 1.1 if HTTP 2 can't be
negotiated with the server. (Added in 7.33.0)
The alias \fICURL_HTTP_VERSION_2\fI was added in 7.43.0 to better reflect the
actual protocol name.
.IP CURL_HTTP_VERSION_2TLS
Attempt HTTP 2 over TLS (HTTPS) only. libcurl will fall back to HTTP 1.1 if
HTTP 2 can't be negotiated with the HTTPS server. For clear text HTTP servers,
libcurl will use 1.1. (Added in 7.47.0)
.SH DEFAULT
CURL_HTTP_VERSION_NONE
.SH PROTOCOLS
HTTP
.SH EXAMPLE
TODO
.SH AVAILABILITY
Along with HTTP
.SH RETURN VALUE
Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_SSLVERSION "(3), " CURLOPT_HTTP200ALIASES "(3), "
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