分享一個今天在開發的是時候遇到的問題
問題原因
客戶端發出一次請求，服務器給出兩次及以上響應
解決方法
清理多余次數響應；每次響應后立馬return掉函數
具體原因可以參考https://stackoverflow.com/questions/7042340/error-cant-set-headers-after-they-are-sent-to-the-client
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