Configuration file path is specified with Apache directive (/etc/httpd/conf/gsweb.conf is an exemple):

    GSWeb_ConfigFilePath /etc/httpd/conf/gsweb.conf

The format is GNUstep/OpenStep property list.
Here is an exemple with all the possible options:

    {
      //Global Parameters
      canDumpStatus = YES;  //YES if server can display status (URL: /GSWeb/status)
      GSWExtensionsFrameworkWebServerResources =
        "/GSW/GSWExtensions/WebServerResources";  // URL of GSWExtensions
                                                  // Framework
                                                  // WebServerResources directory

      //List of applications
      applications = {
        //The 1st application: MyApp
        MyApp = {
          //List of its instances
          instances = {
            //First Instance
            1 = {
              host = 145.146.147.20;  //Host of this instance
              port = 9001;            //Port of this instance
              parameters = {          //Unused
                transport=socket;
              };
            };
          };
        };

        //The 2nd application: AnotherOne
        AnotherOne = {

          // URL of GSWExtensions Framework WebServerResources directory.
          // It overides Global parameter
          GSWExtensionsFrameworkWebServerResources =
            "/GSW/GSWExtensions/WebServerResources";

          // YES to say that this application can be listed when the
          // adaptor don't find an application
          canDump = YES;

          //Unused for the moment
          applicationHeaders = {
            header1 = 1264;
            header2 = 4567;
          };

          //Instances
          instances = {
            //1st instance
            1 = {
              host = 145.146.147.20;
              port = 9002;
              parameters = {
                transport = socket;
              };
            };
          };
        };
        MyAppVoid = {
          // Here we have 3 instances
          instances = {
            1 = {
              host = 145.146.147.20;
              port = 9001;
              parameters = {
                transport = socket;
              };
            };
            2 = {
              host = 145.146.147.21;
              port = 9002;
              parameters = {
                transport=socket;
              };
            };
            5 = {
              host = 145.146.147.22;
              port = 9003;
              parameters = {
                transport=socket;
              };
            };
          };
        };
      };
    };