code: public static String getServerHost() {
          String ret = getLatkeProperty("serverHost");
          if (null == ret) {
              final RequestContext requestContext = REQUEST_CONTEXT.get();
              if (null != requestContext) {
                  ret = requestContext.getRequest().getServerName();
              } else {
                  initPublicIP();
  
                  return PUBLIC_IP;
              }
          }
  
          return ret;
      }
docs: Gets server host.
  
  @return server host