启动多个代理时，websocket通信只能处理一个抓包的返回数据

如启动多个代理
anyproxy -p 4101 -w 4102 -e 4103 -i;
anyproxy -p 4201 -w 4202 -e 4203 -i;

启动-e 为websocket通信端口，-w为web显示端口

但web显示抓包的返回数据-p 4101显示不正常，经测试，websocket进程好像只能有一个存在，如果启动多个websocket通信，返回数据会显示不出的问题。

Reproduce the report by starting two proxy instances with the shown -p, -w, and -e port combinations. Inspect the websocket handling for multiple -e ports and verify that each proxy's web display shows its own captured response; no source files or tests are named in the report.

Written by the indexing model from the issue text.