bad.go

package main

import (
	"encoding/json"
	"net/http"
)

var data map[string][]*int

func main() {
	http.HandleFunc("/set", func(w http.ResponseWriter, r *http.Request) {
		request_body := struct {
			Key  *string `json: "key"`
			Data []int   `json: "data"`
		}{}
		json.NewDecoder(r.Body).Decode(&request_body)
		for _, data_member := range request_body.Data {
			data[*request_body.Key] = append(data[*request_body.Key], &data_member)
		}
	})
	http.HandleFunc("/get", func(w http.ResponseWriter, r *http.Request) {
		response_data := data[r.URL.Query().Get("key")]
		json.NewEncoder(w).Encode(response_data)
	})
	http.ListenAndServe(":8080", nil)
}