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Title: One line description How to effectively modify the buffer in decodeData Description: I'm trying to edit buffer in DecodeData function of Go' filter.But I can't understand why It doesn't work sometimes.For example, the WriteString does not work if the code as below. But when I uncommented "buffer.Set(newData)", it took effect. func (f *filter) DecodeData(buffer api.BufferInstance, endStream bool) api.StatusType { buffer.WriteString("Decodedata") t := time.Now() fmt.Println("time is", t.Format("2006-01-02 15:04:05.000")) if endStream == false { result := make(chan string) // 将data反序列化到map中 reqInfo := make(map[string]interface{}) err := json.Unmarshal([]byte(buffer.String()), &reqInfo) if err != nil { fmt.Println("Error:", err) return api.Continue } nums, ok := reqInfo["nums"].([]interface{}) if ok { reqInfo["nums"] = append(nums, 10) } // 将map重新序列化为json newData, err := json.Marshal(reqInfo) //buffer.Set(newData) go f.post(string(newData), result, &buffer) res, ok := <-result if ok { if num, err := strconv.Atoi(res); err == nil { if num > 1000000 { f.callbacks.SendLocalReply(200, "result too large", map[string]string{}, 0, "too-large") return api.LocalReply } } } } fmt.Println("data is ", buffer.String()) return api.Continue } the result of comment buffer.Set() is "b'{"operation": "add", "nums": [1, 2, 3, 4, 5, 6, 9, 9]}|| response || encodedata append_data'" and the result of uncomment is "b'{"nums":[1,2,3,4,5,6,9,9,10],"operation":"add"}Decoded|| response || encodedata append_data'". It shows that the WriteString and Set on buffer works. And When I am trying to increase the request body(set "nums":[1,2,3,4,5,6,9,9,10,11,12,13]),envoy response with "upstream request timeout". Here is part of this request's log of envoy: [2023-09-08 12:12:46.121][17][debug][client] [source/common/http/codec_client.cc:139] [C5] encode complete data is {"nums":[1,2,3,4,5,6,9,9,10,11,12,13,10],"operation":"add"} time is 2023-09-08 12:12:46.121 data is
[2023-09-08 12:12:48.100][17][debug][router] [source/common/router/router.cc:1017] [C4][S7357123165049975762] upstream timeout [2023-09-08 12:12:48.100][17][debug][router] [source/common/router/upstream_request.cc:557] [C4][S7357123165049975762] resetting pool request [2023-09-08 12:12:48.100][17][debug][client] [source/common/http/codec_client.cc:156] [C5] request reset [2023-09-08 12:12:48.100][17][debug][connection] [source/common/network/connection_impl.cc:139] [C5] closing data_to_write=0 type=1 [2023-09-08 12:12:48.100][17][debug][connection] [source/common/network/connection_impl.cc:250] [C5] closing socket: 1

So I am confused how can I edit the buffer effectively. I hope you can exa [optional Relevant Links:] This is my request code mydata={ "operation":"add", "nums":[1,2,3,4,5,6,9,9,10,11,12,13] } udata = json.dumps(mydata) response = requests.post("http://localhost:10000",data=udata) @doujiang24