Add callback.

i18n/zh-cn/docusaurus-plugin-content-pages/faq-srs-stack.md

@@ -36,6 +36,7 @@
 * [成本优化](#cost-opt)：关于成本和成本优化。
 * [OpenAPI](#openapi): 关于开放API，使用API获取相关信息。
 * [功能列表](#features): 关于支持的功能清单。
+* [HTTP Callback](#http-callback): 关于支持的HTTP回调。
 * [版本规划](#changelog): 关于版本和里程碑。
 
 你也可以在页面中搜索关键字。
@@ -575,6 +576,72 @@ SRS Stack的使用说明，请参考视频[SRS Stack：起步、购买和入门]
 
 欢迎加群探讨SRS Stack的使用，这些SRS的周边服务都是开源的，可以自己定制后部署。
 
+<a name='http-callback'></a><br/><br/><br/>
+
+## HTTP Callback
+
+所有请求的格式是json：
+
+* `Content-Type: application-json`
+
+所有响应都应该遵守：
+
+* 成功：`Status: 200 OK` and `"code": 0`
+* 其他代表失败或错误。
+
+关于如何实现回调的处理，请参考[HTTP Callback](/docs/v6/doc/http-callback#go-example)
+
+### HTTP Callback: on_publish
+
+对于回调事件`on_publish`，协议定义如下：
+
+```json
+Request:
+{
+  "action": "on_unpublish",
+  "opaque": "mytoken",
+  "vhost": "__defaultVhost__",
+  "app": "live",
+  "stream": "livestream",
+  "param": "?secret=8f7605d657c74d69b6b48f532c469bc9",
+  "server_id": "vid-f91k836",
+  "client_id": "e8d29ue3"
+}
+
+Response:
+{
+  "code": 0
+}
+```
+
+* 返回成功，则允许推流。
+* 返回失败，则禁止推流。
+
+### HTTP Callback: on_unpublish
+
+对于回调事件`on_unpublish`，协议定义如下：
+
+```json
+Request:
+{
+  "action": "on_unpublish",
+  "opaque": "mytoken",
+  "vhost": "__defaultVhost__",
+  "app": "live",
+  "stream": "livestream",
+  "param": "?secret=8f7605d657c74d69b6b48f532c469bc9",
+  "server_id": "vid-f91k836",
+  "client_id": "e8d29ue3"
+}
+
+Response:
+{
+  "code": 0
+}
+```
+
+* 错误时忽略。
+
 <a name='changelog'></a><br/><br/><br/>
 
 ## Changelog

src/pages/faq-srs-stack.md

@@ -36,6 +36,7 @@ Quick Content
 * [Cost Optimization](#cost-opt): About cost and cost optimization.
 * [OpenAPI](#openapi): About open API, using API to get related information.
 * [Feature List](#features): About the list of supported features.
+* [HTTP Callback](#http-callback): About HTTP callback.
 * [Version Planning](#changelog): About versions and milestones.
 
 You can also search for keywords on the page.
@@ -561,6 +562,72 @@ Currently, the scenarios and functions supported by SRS Stack, see [Features](ht
 
 Welcome to join the group to discuss the use of SRS Stack. All these SRS peripheral services are open-source and can be customized and deployed by yourself.
 
+<a name='http-callback'></a><br/><br/><br/>
+
+## HTTP Callback
+
+All requests should be:
+
+* `Content-Type: application-json`
+
+All responses should use:
+
+* `Status: 200 OK` and `"code": 0` for success.
+* Otherwise, error or fail.
+
+See examples in [HTTP Callback](/docs/v6/doc/http-callback#go-example)
+
+### HTTP Callback: on_publish
+
+For HTTP callback `on_publish` event:
+
+```json
+Request:
+{
+  "action": "on_unpublish",
+  "opaque": "mytoken",
+  "vhost": "__defaultVhost__",
+  "app": "live",
+  "stream": "livestream",
+  "param": "?secret=8f7605d657c74d69b6b48f532c469bc9",
+  "server_id": "vid-f91k836",
+  "client_id": "e8d29ue3"
+}
+
+Response:
+{
+  "code": 0
+}
+```
+
+* Allow publishing if response success.
+* Reject publishing if response error.
+
+### HTTP Callback: on_unpublish
+
+For HTTP callback `on_unpublish` event:
+
+```json
+Request:
+{
+  "action": "on_unpublish",
+  "opaque": "mytoken",
+  "vhost": "__defaultVhost__",
+  "app": "live",
+  "stream": "livestream",
+  "param": "?secret=8f7605d657c74d69b6b48f532c469bc9",
+  "server_id": "vid-f91k836",
+  "client_id": "e8d29ue3"
+}
+
+Response:
+{
+  "code": 0
+}
+```
+
+* Ignore any response error.
+
 <a name='changelog'></a><br/><br/><br/>
 
 ## Changelog