[Bug] [Website-9764]add http alert doc and change body param to unnecessary (#9792)

* add http alert doc and change body param to unnecessary

* submit http en doc and fix doc

* fix http doc

docs/configs/docsdev.js

@@ -245,6 +245,11 @@ export default {
                                 title: 'Script',
                                 link: '/en-us/docs/dev/user_doc/guide/alert/script.html',
                             },
+                            ,
+                            {
+                                title: 'Http',
+                                link: '/en-us/docs/dev/user_doc/guide/alert/http.html',
+                            },
                         ],
                     },
                     {
@@ -567,6 +572,10 @@ export default {
                                 title: '脚本告警',
                                 link: '/zh-cn/docs/dev/user_doc/guide/alert/script.html',
                             },
+                            {
+                                title: 'Http告警',
+                                link: '/zh-cn/docs/dev/user_doc/guide/alert/http.html',
+                            },
                         ],
                     },
                     {

docs/docs/en/guide/alert/http.md

@@ -0,0 +1,34 @@
+# HTTP
+
+If you need to use `Http script` for alerting, create an alert instance in the alert instance management and select the `Http` plugin.
+
+## Parameter Configuration
+
+* URL
+  > The `Http` request URL needs to contain protocol, host, path and parameters if the method is `GET`
+* Request Type
+  > Select the request type from `POST` or `GET`
+* Headers
+  > The headers of the `Http` request in JSON format
+* Body
+  > The request body of the `Http` request in JSON format, when using `POST` method to alert
+* Content Field
+  > The field name to place the alert information
+
+## Send Type
+
+Using `POST` and `GET` method to send `Http` request in the `Request Type`.
+
+### GET Http
+
+Send alert information by `Http` GET method.
+The following shows the `GET` configuration example:
+
+![enterprise-wechat-app-msg-config](/img/alert/http-get-example.png)
+
+### POST Http
+
+Send alert information inside `Http` body by `Http` POST method.
+The following shows the `POST` configuration example:
+
+![enterprise-wechat-app-msg-config](/img/alert/http-post-example.png)

docs/docs/zh/guide/alert/http.md

@@ -0,0 +1,34 @@
+# HTTP告警
+
+如果您需要使用到`Http`（GET或POST）进行告警，请在告警实例管理里创建告警实例，选择`Http`插件。
+
+## 参数配置
+
+* URL
+  > 访问的`Http`连接URL,需要包含协议、Host、路径，如果是GET方法可以添加参数
+* 请求方式
+  > 选择该请求为POST或GET方法
+* 请求头
+  > `Http`请求的完整请求头，以JSON为格式
+* 请求体
+  > `Http`请求的完整请求体，以JSON为格式，GET方法不需要写该参数
+* 内容字段
+  > 放置本次告警告警信息的字段名称
+
+## 发送类型
+
+其中`Request Type`分别对应使用`POST`方法和`GET`方法进行`Http`告警。
+
+### GET Http告警
+
+GET `Http`告警指将告警结果作为参数通过`Http` GET方法进行请求。
+下图是GET告警配置的示例:
+
+![enterprise-wechat-app-msg-config](/img/alert/http-get-example.png)
+
+### POST Http告警
+
+POST `Http`告警指将告警结果作为`BODY`参数通过`Http`POST方法进行请求。
+下图是POST告警配置的示例:
+
+![enterprise-wechat-app-msg-config](/img/alert/http-post-example.png)

dolphinscheduler-alert/dolphinscheduler-alert-plugins/dolphinscheduler-alert-http/src/main/java/org/apache/dolphinscheduler/plugin/alert/http/HttpAlertChannelFactory.java

@@ -55,7 +55,7 @@ public final class HttpAlertChannelFactory implements AlertChannelFactory {
         InputParam bodyParams = InputParam.newBuilder(HttpAlertConstants.NAME_BODY_PARAMS, HttpAlertConstants.BODY_PARAMS)
                                           .setPlaceholder("input request body as JSON format ")
                                           .addValidate(Validate.newBuilder()
-                                                               .setRequired(true)
+                                                               .setRequired(false)
                                                                .build())
                                           .build();