docs(agent): add advanced example for custom request and response

- Include example of using JsonPath to parse response
- Provide sample request and response format
- Explain the structure of the response, focusing on 'answer' type and 'created_at' field

Author: phodal

docs/agent/custom-request-response.md

@@ -26,3 +26,29 @@ response format under the `connector` field.
   "interactive": "ChatPanel"
 }
 ```
+
+## Advanced example
+
+We used [JsonPath](https://github.com/json-path/JsonPath) to parse response, If you want to get stream content from Coze
+API, you can use `$[?(@.type == 'answer' && !(@.created_at))].content` to filter the content.
+
+Here some examples of the request and response format:
+
+```bash
+event:conversation.message.delta
+data:{"id":"7490890868547862564","conversation_id":"7490890868547682340","bot_id":"7490858512726458380","role":"assistant","type":"answer","content":"All","content_type":"text","chat_id":"7490890868547698724","section_id":"7490890868547682340"}
+
+event:conversation.message.delta
+data:{"id":"7490890868547862564","conversation_id":"7490890868547682340","bot_id":"7490858512726458380","role":"assistant","type":"answer","content":"Files","content_type":"text","chat_id":"7490890868547698724","section_id":"7490890868547682340"}
+
+event:conversation.message.completed
+data:{"id":"7490890868547862564","conversation_id":"7490890868547682340","bot_id":"7490858512726458380","role":"assistant","type":"answer","content":"listAllFiles","content_type":"text","chat_id":"7490890868547698724","section_id":"7490890868547682340","created_at":1744108946}
+
+event:conversation.message.completed
+data:{"id":"7490890877657923603","conversation_id":"7490890868547682340","bot_id":"7490858512726458380","role":"assistant","type":"verbose","content":"{\"msg_type\":\"generate_answer_finish\",\"data\":\"{\\\"finish_reason\\\":0,\\\"FinData\\\":\\\"\\\"}\",\"from_module\":null,\"from_unit\":null}","content_type":"text","chat_id":"7490890868547698724","section_id":"7490890868547682340","created_at":1744108948,"updated_at":1744108948}
+```
+
+explain:
+
+1. `answer` is the type of the response, which is the content you want to get.
+2. `created_at` is the time when the response is completed, which is not needed in the response.