Discarded error from serversInfo.refresh() in proxy.go

[hklcf]

Bug Description

In the periodic server refresh goroutine in proxy.go, the error from serversInfo.refresh() is silently discarded using the blank identifier. This error contains information about which servers failed and why.

Affected Code

proxy.go:331:

liveServers, _ = proxy.serversInfo.refresh(proxy)

Impact

Diagnostic information about server failures is lost. If all servers fail, liveServers will be 0, but the reason for the failure is not logged, making debugging difficult.

Fix

Log the error:

liveServers, err = proxy.serversInfo.refresh(proxy)
if err != nil {
    dlog.Warnf("Server refresh error: %v", err)
}