code: func SrcIpIs(ips ...string) ReqCondition {
  	return ReqConditionFunc(func(req *http.Request, ctx *ProxyCtx) bool {
  		for _, ip := range ips {
  			if strings.HasPrefix(req.RemoteAddr, ip+":") {
  				return true
  			}
  		}
  		return false
  	})
  }
docs: // SrcIpIs returns a ReqCondition testing whether the source IP of the request is one of the given strings