Warn when Headscale is running behind a wrongly configured proxy
@@ -23,6 +23,19 @@ func (h *Headscale) NoiseUpgradeHandler(
) {
log.Trace().Caller().Msgf("Noise upgrade handler for client %s", req.RemoteAddr)
+ upgrade := req.Header.Get("Upgrade")
+ if upgrade == "" {
+ // This probably means that the user is running Headscale behind an
+ // improperly configured reverse proxy. TS2021 requires WebSockets to
+ // be passed to Headscale. Let's give them a hint.
+ log.Warn().
+ Caller().
+ Msg("No Upgrade header found in TS2021 request. If running headscale behind a reverse proxy, make sure it is configured to pass WebSockets through.")
+ http.Error(writer, "Internal error", http.StatusInternalServerError)
+
+ return
+ }
+
noiseConn, err := controlhttp.AcceptHTTP(req.Context(), writer, req, *h.noisePrivateKey)
if err != nil {
log.Error().Err(err).Msg("noise upgrade failed")
