code: private boolean isRedirectHostTheSameAsLocalHost(String exitPage, String logoutURLhost, String hostFullName, String shortName, String ipAddress) {
          String localHostIpAddress = "127.0.0.1";
          boolean acceptURL = false;
          if (logoutURLhost.equalsIgnoreCase("localhost") || logoutURLhost.equals(localHostIpAddress) ||
              (hostFullName != null && logoutURLhost.equalsIgnoreCase(hostFullName)) ||
              (shortName != null && logoutURLhost.equalsIgnoreCase(shortName)) ||
              (ipAddress != null && logoutURLhost.equals(ipAddress))) {
  
              acceptURL = true;
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  Tr.debug(tc, "exitPage points to this host: all ok");
          }
          return acceptURL;
      }
docs: Check the logout URL host name with various combination of shortName, full name and ipAddress.
  
  @param logoutURLhost
  @param hostFullName
  @param shortName
  @param ipAddress