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filter is not described

http_request_version filter-hook . WP 2.7.0

Filters the version of the HTTP protocol used in a request.

Usage

add_filter( 'http_request_version', 'filter_function_name_6495', 10, 2 );
function filter_function_name_6495( $version, $url ){
	// filter...

	return $version;
}
$version(string)
Version of HTTP used. Accepts '1.0' and '1.1'.
Default: '1.0'
$url(string)
The request URL.

Changelog

Since 2.7.0 Introduced.
Since 5.1.0 The $url parameter was added.

Where the hook is called

WP_Http::request()
http_request_version
wp-includes/class-http.php 181
'httpversion'         => apply_filters( 'http_request_version', '1.0', $url ),

Where the hook is used (in WP core)

Usage not found!