Returns the HTTP protocol sent by the server.

Return

Source

function wp_get_server_protocol() {
	$protocol = isset( $_SERVER['SERVER_PROTOCOL'] ) ? $_SERVER['SERVER_PROTOCOL'] : '';

	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0', 'HTTP/3' ), true ) ) {
		$protocol = 'HTTP/1.0';
	}

	return $protocol;
}

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