Add more APIs in SignalR Service v1

Add more APIs supported and minor updates
1. Add/Remove/Send/Close connection
2. Remove user from all groups
3. Service health
4. Add response code for GET methods
5. Minor uniform expression

Author: JialinXin

articles/azure-signalr/signalr-quickstart-rest-api.md

@@ -125,10 +125,17 @@ API | `1.0-preview` | `1.0`
 [Broadcast to all](#broadcast) | **✓** | **✓**
 [Broadcast to a group](#broadcast-group) | **✓** | **✓**
 Broadcast to some groups | **✓** (Deprecated) | `N / A`
-[Send to specific users](#send-user) | **✓** | **✓**
+[Send to a user](#send-user) | **✓** | **✓**
 Send to some users | **✓** (Deprecated) | `N / A`
 [Adding a user to a group](#add-user-to-group) | `N / A` | **✓**
 [Removing a user from a group](#remove-user-from-group) | `N / A` | **✓**
+[Check user existence](#check-user-existence) | `N / A` | **✓**
+[Remove a user from all groups](#remove-user-from-all-groups) | `N / A` | **✓**
+[Send to a connection](#send-connection) | `N / A` | **✓**
+[Add a connection to a group](#add-connection-to-group) | `N / A` | **✓**
+[Remove a connection from a group](#remove-connection-from-group) | `N / A` | **✓**
+[Close a client connection](#close-connection) | `N / A` | **✓**
+[Service Health](#service-health) | `N / A` | **✓**
 
 <a name="broadcast"> </a>
 ### Broadcast to everyone
@@ -147,7 +154,7 @@ Version | API HTTP Method | Request URL | Request body
 `1.0` | `POST` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>` | Same as above
 
 <a name="send-user"> </a>
-### Sending to specific users
+### Sending to a user
 
 Version | API HTTP Method | Request URL | Request body
 --- | --- | --- | ---
@@ -159,14 +166,77 @@ Version | API HTTP Method | Request URL | Request body
 
 Version | API HTTP Method | Request URL
 --- | --- | ---
-`1.0` | `PUT` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<userid>`
+`1.0` | `PUT` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>`
 
 <a name="remove-user-from-group"> </a>
 ### Removing a user from a group
 
 Version | API HTTP Method | Request URL
 --- | --- | ---
-`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<userid>`
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>`
+
+<a name="check-user-existence"> </a>
+### Check user existence in a group
+
+API Version | API HTTP Method | Request URL
+---|---|---
+`1.0` | `GET` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/users/<user-id>/groups/<group-name>`
+`1.0` | `GET` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/users/<user-id>` 
+
+Response Status Code | Description
+---|---
+`200` | User exists
+`404` | User not exists
+
+<a name="remove-user-from-all-groups"> </a>
+### Remove a user from all groups
+
+API Version | API HTTP Method | Request URL
+---|---|---
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/users/<user-id>/groups`
+
+<a name="send-connection"> </a>
+### Send message to a connection
+
+API Version | API HTTP Method | Request URL | Request Body
+---|---|---|---
+`1.0` | `POST` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>` | `{ "target":"<method-name>", "arguments":[ ... ] }`
+
+<a name="add-connection-to-group"> </a>
+### Add a connection to a group
+
+API Version | API HTTP Method | Request URL
+---|---|---
+`1.0` | `PUT` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/connections/<connection-id>`
+`1.0` | `PUT` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>/groups/<group-name>`
+
+<a name="remove-connection-from-group"> </a>
+### Remove a connection from a group
+
+API Version | API HTTP Method | Request URL
+---|---|---
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/groups/<group-name>/connections/<connection-id>`
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>/groups/<group-name>`
+
+<a name="close-connection"> </a>
+### Close a client connection
+
+API Version | API HTTP Method | Request URL
+---|---|---
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>`
+`1.0` | `DELETE` | `https://<instance-name>.service.signalr.net/api/v1/hubs/<hub-name>/connections/<connection-id>?reason=<close-reason>`
+
+<a name="service-health"> </a>
+### Service Health
+
+API Version | API HTTP Method | Request URL
+---|---|---                             
+`1.0` | `GET` | `https://<instance-name>.service.signalr.net/api/v1/health`
+
+Response Status Code | Description
+---|---
+`200` | Service Good
+`503` | Service Unavailable
 
 [!INCLUDE [Cleanup](includes/signalr-quickstart-cleanup.md)]