From 678feb74d14a1c19a8daa5728acb0ae4bd641ae4 Mon Sep 17 00:00:00 2001
From: gulewin <guy.lewin@microsoft.com>
Date: Fri, 13 Mar 2020 23:46:11 -0400
Subject: [PATCH] doc: update documentation to mention Ping server plugin

---
 doc/server_plugin.md | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/doc/server_plugin.md b/doc/server_plugin.md
index fa511b3a..1f1d7e28 100644
--- a/doc/server_plugin.md
+++ b/doc/server_plugin.md
@@ -70,7 +70,7 @@ The response can look like any of the following:
 
 ### Operation
 
-Currently `Login` and `NewProxy` operations are supported.
+Currently `Login`, `NewProxy` and `Ping` operations are supported.
 
 #### Login
 
@@ -135,6 +135,24 @@ Create new proxy
 }
 ```
 
+#### Ping
+
+Heartbeat from frpc
+
+```
+{
+    "content": {
+        "user": {
+            "user": <string>,
+            "metas": map<string>string
+            "run_id": <string>
+        },
+        "timestamp": <int64>,
+        "privilege_key": <string>
+    }
+}
+```
+
 ### Server Plugin Configuration
 
 ```ini
@@ -155,7 +173,7 @@ ops = NewProxy
 
 addr: the address where the external RPC service listens on.
 path: http request url path for the POST request.
-ops: operations plugin needs to handle (e.g. "Login", "NewProxy").
+ops: operations plugin needs to handle (e.g. "Login", "NewProxy", "Ping").
 
 ### Metadata