apply_filters( 'http_request_version', string $version, string $url )

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

Parameters

$version string: Version of HTTP used. Accepts '1.0' and '1.1'. Default '1.0'.
$url string: The request URL.

File: wp-includes/class-wp-http.php. View all references

'httpversion'         => apply_filters( 'http_request_version', '1.0', $url ),

Used By	Description
WP_Http::request() wp-includes/class-wp-http.php	Send an HTTP request to a URI.

Version	Description
5.1.0	The `$url` parameter was added.
2.7.0	Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/http_request_version