docs: public Observable<ServiceResponse<VpnProfileResponseInner>> generateVpnProfileWithServiceResponseAsync(String resourceGroupName, String gatewayName) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (gatewayName == null) {
              throw new IllegalArgumentException("Parameter gatewayName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          final String apiVersion = "2018-08-01";
          final AuthenticationMethod authenticationMethod = null;
          P2SVpnProfileParameters parameters = new P2SVpnProfileParameters();
          parameters.withAuthenticationMethod(null);
          Observable<Response<ResponseBody>> observable = service.generateVpnProfile(resourceGroupName, gatewayName, this.client.subscriptionId(), apiVersion, this.client.acceptLanguage(), parameters, this.client.userAgent());
          return client.getAzureClient().getPostOrDeleteResultAsync(observable, new TypeToken<VpnProfileResponseInner>() { }.getType());
      }