WP_REST_Server::send_header( string $key, string $value )

Source

public function send_header( $key, $value ) {
	/*
	 * Sanitize as per RFC2616 (Section 4.2):
	 *
	 * Any LWS that occurs between field-content MAY be replaced with a
	 * single SP before interpreting the field value or forwarding the
	 * message downstream.
	 */
	$value = preg_replace( '/\s+/', ' ', $value );
	header( sprintf( '%s: %s', $key, $value ) );
}

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