WP_REST_Request::canonicalize_header_name( string $key )

Canonicalizes the header name.


Description

Ensures that header names are always treated the same regardless of source. Header names are always case insensitive.

Note that we treat - (dashes) and _ (underscores) as the same character, as per header parsing rules in both Apache and nginx.


Parameters

$key

(Required) Header name.


Return

(string) Canonicalized name.


Source

File: wp-includes/rest-api/class-wp-rest-request.php

	public static function canonicalize_header_name( $key ) {
		$key = strtolower( $key );
		$key = str_replace( '-', '_', $key );

		return $key;
	}


Changelog

Changelog
Version Description
WP-4.4.0 Introduced.