ntwb / wordpress

	 * @param string $key Header name, will be canonicalized to lowercase.

	 * @return string|null String value if set, null otherwise.

	 */

	public function get_header( $key ) {

		$key = $this->canonicalize_header_name( $key );

		if ( ! isset( $this->headers[ $key ] ) ) {

			return null;

		}

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

	}

	/**

	 * Retrieves header values from the request.

	 * @param string $key Header name, will be canonicalized to lowercase.

	 * @return array|null List of string values if set, null otherwise.

	 */

	public function get_header_as_array( $key ) {

		$key = $this->canonicalize_header_name( $key );

		if ( ! isset( $this->headers[ $key ] ) ) {

			return null;

		}

		return $this->headers[ $key ];

	}

	/**

	 * Sets the header on request.