一个至关重要的问题，支不支持多IP出口

我的意思 服务器端 是 有多个IP的 客户端指定 100.100.100.1 这个代理IP，那么服务器端就会用100.100.100.1去获取内容，同理100.2那么获取时也是用100.2 ，
现的情况是，我有多个IP，但是虽然我客户端指定了不同的IP代理地址，但是始终获取内容时都是通过100.1去获取了

Start by tracing how the proxy server selects the outbound connection address when a client specifies a proxy IP. Check whether the requested address is carried through to content fetching and how multiple server IPs are exposed. Done means requests consistently use the selected local IP instead of a single default, with behavior verified across multiple configured addresses.

Written by the indexing model from the issue text.