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Re: HTTP2: how to know the HTTP version used by libcurl

From: Ganesh Nikam <>
Date: Tue, 26 Apr 2016 15:11:12 +0530

Hi Daniel,

Thanks for the quick reply. I will check the code and if possible I will
add the getinfo parameter.

The 2nd point about answers my query. Similar to browsers (like firefox and
chrome which support http/2 with HTTPS only), we can configure libcurl,
using this HTTP version.

Ganesh Nikam

On Tue, Apr 26, 2016 at 2:57 PM, Daniel Stenberg <> wrote:

> On Tue, 26 Apr 2016, Ganesh Nikam wrote:
> 1. Is there any way to know the current HTTP version getting used in
>> libcurl requests ? I checked getinfo parameters but there is not parameter
>> for HTTP version ? In our application we want to know HTTP version getting
>> used for current requests.
> We really should provide a getinfo parameter for that! Are you interested
> in helping us make that happen?
> Right now the best way is probably to provide a header callback and parse
> out the version yourself in the first response header. (By HTTP terminology
> it is the status line and not a header, but it is passed to the header
> callback nonetheless.)
> 2. If we have can send HTTPS requests by setting http version to
>> CURL_HTTP_VERSION_2_0, then what is the purpose of CURL_HTTP_VERSION_2TLS ?
> If you know you work with HTTPS then there's no difference between them.
> The CURL_HTTP_VERSION_2TLS option is there for those who want to use both
> HTTP and HTTPS URLs and have libcurl use HTTP/2 automatically only for the
> HTTPS ones.
> It should also make it possible for libcurl to (at some point in the
> future) perhaps switch to CURL_HTTP_VERSION_2TLS as default selected HTTP
> version.
> --
> /
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Received on 2016-04-26