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nginx代理websocket，出现websocket 1006 (abnormal closure)错误
source link: https://blog.csdn.net/oqqYuan1234567890/article/details/70285866
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情况：部署到服务器上的websocket程序，未加心跳，发现隔一阵子就会断开，出现1006 (abnormal closure)错误。
原因：代理参数的proxy_read_timeout默认是60s，只要超过这段时间没有通信，就会自动断开tcp连接
解决办法：
- 修改参数proxy_read_timeout，比如在代理设置添加 proxy_read_timeout 300s;
- 添加心跳，心跳的间隔要小于默认的读超时proxy_read_timeout 60s，这样程序就会可以在60s的时间窗口内读到数据，不会被nginx断开连接。
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