check if SERVER_PROTOCOL is empty in load.php

[malthert]

In php cli requests, the server_protocol may not be set, throwing a notice
This should be changed in /wp-includes/wp-load.php

function wp_get_server_protocol() {
	$protocol = $_SERVER['SERVER_PROTOCOL'];
	if ( ! in_array( $protocol, array( 'HTTP/1.1', 'HTTP/2', 'HTTP/2.0' ) ) ) {
		$protocol = 'HTTP/1.0';
	}
	return $protocol;
}

to this:

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' ), true ) ) {
		$protocol = 'HTTP/1.0';
	}
	return $protocol;
}

[thakkarhardik]

Yes @malthert , it did throw a warning. I have added a patch as per your suggestion.

[SergeyBiryukov]

Previously: #21971

[SergeyBiryukov]

In 45400:

Bootstrap/Load: In wp_get_server_protocol(), check if $_SERVER['SERVER_PROTOCOL'] is defined, to avoid a notice in CLI context.

Props thakkarhardik, malthert.
Fixes #47005.