code: public String getQueryString()
      {
          if (WCCustomProperties.CHECK_REQUEST_OBJECT_IN_USE){
              checkRequestObjectInUse();
          }
          SRTServletRequestThreadData reqData = SRTServletRequestThreadData.getInstance();
          if (reqData.getQueryString()==null && !reqData.isQSSetExplicit())
              if (_request != null && reqData != null) {
                  reqData.setQueryString(_request.getQueryString());             
              }
          // 321485
          String queryString = null;
          if (reqData != null)
              queryString = reqData.getQueryString();
          if (TraceComponent.isAnyTracingEnabled()&&logger.isLoggable (Level.FINE)) {  //306998.15
              logger.logp(Level.FINE, CLASS_NAME,"getQueryString", " queryString --> " + PasswordNullifier.nullifyParams(queryString));
          }
          return queryString;
      }
docs: Returns the query string part of the servlet URI, or null if none.
  Same as the CGI variable QUERY_STRING.