最近在使用Xcode自帶的NSURLConnection請求時，發現有時候回報這個錯誤，原因后來跟服務器端問了一下，是服務器關了，所以長時間無法響應，導致請求不到data，所以顯示成nil，需要在請求的data里面判斷data，如果data是nil則返回，這樣就不會崩了。
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