question: public static String addProtocolToUrl ( String url ) { if ( ! url . startsWith ( HTTP_PROTOCOL_PREFIX ) && ! url . startsWith ( HTTPS_PROTOCOL_PREFIX ) && ! url . startsWith ( FILE_PROTOCOL_PREFIX ) ) { if ( url . startsWith ( FILE_PREFIX ) ) { url = FILE_PROTOCOL_PREFIX + url ; } else { url = HTTP_PROTOCOL_PREFIX + url ; } } return url ; }
target:  This method add the protocol to the url if the protocol is missing