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**練習 1.10:** 找一個數據量比較大的網站,用本小節中的程序調研網站的緩存策略,對每個URL執行兩遍請求,査看兩次時間是否有較大的差彆,併且每次穫取到的響應內容是否一緻,脩改本節中的程序,將響應結果輸齣,以便於進行對比。