async fn create_app(
        &self,
        input: CreateAppRequest,
    ) -> Result<CreateAppResponse, RusotoError<CreateAppError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "SageMaker.CreateApp");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, CreateAppError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response).deserialize::<CreateAppResponse, _>()
    }
<p>Creates a running app for the specified UserProfile. Supported apps are <code>JupyterServer</code> and <code>KernelGateway</code>. This operation is automatically invoked by Amazon SageMaker Studio upon access to the associated Domain, and when new kernel configurations are selected by the user. A user may have multiple Apps active simultaneously.</p>
rusoto/services/sagemaker/src/generated.rs