providers/proxy: fix backend override persisting for other users

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/outpost/proxyv2/application/mode_proxy.go

@@ -71,18 +71,20 @@ func (a *Application) configureProxy() error {
 	return nil
 }
 
-func (a *Application) proxyModifyRequest(u *url.URL) func(req *http.Request) {
+func (a *Application) proxyModifyRequest(ou *url.URL) func(req *http.Request) {
 	return func(r *http.Request) {
 		claims, _ := a.getClaims(r)
 		if claims.Proxy.BackendOverride != "" {
-			var err error
-			u, err = url.Parse(claims.Proxy.BackendOverride)
+			u, err := url.Parse(claims.Proxy.BackendOverride)
 			if err != nil {
 				a.log.WithField("backend_override", claims.Proxy.BackendOverride).WithError(err).Warning("failed parse user backend override")
 			}
-		}
 			r.URL.Scheme = u.Scheme
 			r.URL.Host = u.Host
+		} else {
+			r.URL.Scheme = ou.Scheme
+			r.URL.Host = ou.Host
+		}
 	}
 }