nbio: websocket: reading loop conflict with 3rd frameworks that implement http.ResponseWriter themselves

gorilla和gws基本也在1.5万左右出现timeout。用了一个rust框架大概在2.2万左右。

用 wsbench 测试下, 看看会不会timeout, wsbench 会限制建立连接的并发.

go install -v github.com/lxzan/wsbench@v1.0.13
wsbench  broadcast -c 20000 -p 100 -i 5  -n 1 -u ws://127.0.0.1:9000