code: public HttpServiceTracker createServiceTracker(BundleContext context, HttpContext httpContext, Dictionary<String, String> dictionary)
      {
          if (httpContext == null)
              httpContext = getHttpContext();
          return new HttpServiceTracker(context, httpContext, dictionary);
      }
docs: Create the service tracker.
  @param context
  @param httpContext
  @param dictionary
  @return