GET /socket.io/?EIO=3&transport=websocket

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GET /socket.io/?EIO=3&transport=websocket

原因：

js一直在访问后端socket.io：

var o=t("./url"),i=t("socket.io-parser"),s=t("./manager"),a=t("debug")("socket.io-client");e.exports=n=r;var c=n.managers={};n.protocol=i.protocol,n.connect=r,n.Manager=t("./manager"),n.Socket=t("./socket")},{"./manager":3,"./socket":5,"./url":6,debug:10,"socket.io-parser":44}],3:[function(t,e,n){function r(t,e){return this instanceof r?(t&&"object"==typeof t&&(e=t,t=void 0),e=e||{},e.path=e.path||"/socket.io",this.nsps={},this.subs=[],this.opts=e,this.reconnection(e.reconnection!==!1),this.reconnectionAttempts(e.reconnectionAttempts||1/0),this.reconnectionDelay(e.reconnectionDelay||1e3),this.reconnectionDelayMax(e.reconnectionDelayMax||5e3),this.randomizationFactor(e.randomizationFactor||.5),this.backoff=new h({min:this.reconnectionDelay(),max:this.reconnectionDelayMax(),jitter:this.randomizationFactor()}),this.timeout(null==e.timeout?2e4:e.timeout),this.readyState="closed",this.uri=t,this.connected=[],this.encoding=!1,this.packetBuffer=[],this.encoder=new a.Encoder,this.decoder=new a.Decoder,this.autoConnect=e.autoConnect!==!1,void(this.autoConnect&&this.open())):new r(t,e)}