WP_REST_Request::get_header( string $key )

Retrieves the given header from the request.

Description

If the header has multiple values, they will be concatenated with a comma as per the HTTP specification. Be aware that some non-compliant headers (notably cookie headers) cannot be joined this way.

Parameters

$key: (Required) Header name, will be canonicalized to lowercase.

Return

(string|null) String value if set, null otherwise.

Source

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

	public function get_header( $key ) {
		$key = $this->canonicalize_header_name( $key );

		if ( ! isset( $this->headers[ $key ] ) ) {
			return null;
		}

		return implode( ',', $this->headers[ $key ] );
	}

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Changelog

Changelog
Version	Description
4.4.0	Introduced.