derp/derphttp: only log about a weird upgrade if any was specified
Otherwise random browser requests to /derp cause log spam.
@@ -23,7 +23,9 @@ func Handler(s *derp.Server) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
up := strings.ToLower(r.Header.Get("Upgrade"))
if up != "websocket" && up != "derp" {
+ if up != "" {
log.Printf("Weird upgrade: %q", up)
+ }
http.Error(w, "DERP requires connection upgrade", http.StatusUpgradeRequired)
return
}
