chunjun http connector的使用说明

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提供了http connector，但没有具体的使用说明文档，希望能够在文档里面完善补充下。

两个具体问题： 1、现在是默认每隔3s去调用一次接口嘛？

2022-03-07 16:08:09.078 [Legacy Source Thread - Source: httpsourcefactory -> Sink: streamsinkfactory (1/1)#0] INFO  com.dtstack.flinkx.connector.stream.util.TablePrintUtil  -
+-------------------------------------------------------------------------------------+
|                                        col0                                         |
+-------------------------------------------------------------------------------------+
| {"date":"03-07-2022","milliseconds_since_epoch":1646640488971,"time":"08:08:08 AM"} |
+-------------------------------------------------------------------------------------+

2022-03-07 16:08:12.078 [restApiReader-thread] DEBUG com.dtstack.flinkx.connector.http.client.HttpClient  - currentParam is HttpRequestParam{body={}, header={}, param={}}
2022-03-07 16:08:12.078 [restApiReader-thread] DEBUG com.dtstack.flinkx.connector.http.common.HttpUtil  - current request url: http://date.jsontest.com/  current method:get

2022-03-07 16:08:12.294 [Legacy Source Thread - Source: httpsourcefactory -> Sink: streamsinkfactory (1/1)#0] INFO  com.dtstack.flinkx.connector.stream.util.TablePrintUtil  -
+-------------------------------------------------------------------------------------+
|                                        col0                                         |
+-------------------------------------------------------------------------------------+
| {"date":"03-07-2022","milliseconds_since_epoch":1646640492193,"time":"08:08:12 AM"} |
+-------------------------------------------------------------------------------------+

2、如何处理两次http调用之前的增量处理？