Merge pull request #92734 from Juliako/patch-120

Update stream-files-tutorial-with-rest.md

Author: PRMerger12

articles/media-services/latest/stream-files-tutorial-with-rest.md

@@ -11,7 +11,7 @@ ms.service: media-services
 ms.workload: 
 ms.topic: tutorial
 ms.custom: mvc
-ms.date: 04/22/2019
+ms.date: 10/21/2019
 ms.author: juliako
 ---
 
@@ -90,11 +90,12 @@ Clone a GitHub repository that contains the  Postman collection and environment
 In this section, we send requests that are relevant to encoding and creating URLs so you can stream your file. Specifically, the following requests are sent:
 
 1. Get Azure AD Token for Service Principal Authentication
+1. Start a Streaming Endpoint
 2. Create an output asset
-3. Create a **Transform**
-4. Create a **Job**
-5. Create a **Streaming Locator**
-6. List paths of the **Streaming Locator**
+3. Create a Transform
+4. Create a Job
+5. Create a Streaming Locator
+6. List paths of the Streaming Locator
 
 > [!Note]
 >  This tutorial assumes you are creating all resources with unique names.  
@@ -115,6 +116,33 @@ In this section, we send requests that are relevant to encoding and creating URL
 
     ![Get AAD token](./media/develop-with-postman/postman-get-aad-auth-token.png)
 
+
+### Start a Streaming Endpoint
+
+To enable streaming, you first have to start the [Streaming Endpoint](https://docs.microsoft.com/azure/media-services/latest/streaming-endpoint-concept) from which you want to stream the video.
+
+> [!NOTE]
+> You are only billed when your Streaming Endpoint is in the running state.
+
+1. In the left window of the Postman app, select "Streaming and Live".
+2. Then, select "Start StreamingEndpoint".
+3. Press **Send**.
+
+    * The following **POST** operation is sent:
+
+        ```
+        https://management.azure.com/subscriptions/:subscriptionId/resourceGroups/:resourceGroupName/providers/Microsoft.Media/mediaservices/:accountName/streamingEndpoints/:streamingEndpointName/start?api-version={{api-version}}
+        ```
+    * If the request is successful, the `Status: 202 Accepted` is returned.
+
+        This status means that the request has been accepted for processing; however, the processing has not been completed. You can query for the operation status based on the value in the `Azure-AsyncOperation` response header.
+
+        For example, the following GET operation returns the status of your operation:
+        
+        `https://management.azure.com/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/<resourceGroupName>/providers/Microsoft.Media/mediaservices/<accountName>/streamingendpointoperations/1be71957-4edc-4f3c-a29d-5c2777136a2e?api-version=2018-07-01`
+
+        The [track asynchronous Azure operations](https://docs.microsoft.com/azure/azure-resource-manager/resource-manager-async-operations) article explains in depth how to track the status of asynchronous Azure operations through values returned in the response.
+
 ### Create an output asset
 
 The output [Asset](https://docs.microsoft.com/rest/api/media/assets) stores the result of your encoding job.