code: public Observable<VnetInfoInner> getVnetFromServerFarmAsync(String resourceGroupName, String name, String vnetName) {
          return getVnetFromServerFarmWithServiceResponseAsync(resourceGroupName, name, vnetName).map(new Func1<ServiceResponse<VnetInfoInner>, VnetInfoInner>() {
              @Override
              public VnetInfoInner call(ServiceResponse<VnetInfoInner> response) {
                  return response.body();
              }
          });
      }
docs: Get a Virtual Network associated with an App Service plan.
  Get a Virtual Network associated with an App Service plan.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param name Name of the App Service plan.
  @param vnetName Name of the Virtual Network.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the VnetInfoInner object