分享一个今天在开发的是时候遇到的问题
问题原因
客户端发出一次请求，服务器给出两次及以上响应
解决方法
清理多余次数响应；每次响应后立马return掉函数
具体原因可以参考https://stackoverflow.com/questions/7042340/error-cant-set-headers-after-they-are-sent-to-the-client
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