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                ~~~ package main import ( "fmt" "math/rand" "net/http" "time" ) func main() { http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { // 模擬處理請求之前的負載檢查 if isOverloaded() { // 降級服務,返回默認響應 fmt.Fprint(w, "Service is degraded. Please try again later.") return } // 復雜的數據查詢或服務調用 data, err := fetchData() if err != nil { // 處理錯誤或返回默認響應 fmt.Fprint(w, "Error occurred. Please try again later.") return } // 返回正常響應 fmt.Fprint(w, data) }) http.ListenAndServe(":8080", nil) } // 模擬負載檢查,隨機返回 true 或 false func isOverloaded() bool { return rand.Float32() < 0.5 } // 模擬數據查詢或服務調用 func fetchData() (string, error) { // 模擬請求可能的延遲 time.Sleep(1 * time.Second) // 模擬數據查詢失敗 if rand.Float32() < 0.2 { return "", fmt.Errorf("Data query failed") } // 模擬成功的數據查詢 return "Data from service", nil } ~~~
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