func newLogged(req *http.Request, w http.ResponseWriter) *respLogger {
	return newLoggedWithStartTime(req, w, time.Now())
}

// LogOf returns the logger hiding in w. If there is not an existing logger
// then a passthroughLogger will be created which will log to stdout immediately
// when Addf is called.
func LogOf(req *http.Request, w http.ResponseWriter) logger {
	if rl := respLoggerFromRequest(req); rl != nil {
		return rl
	}

			if err != nil {
				t.Errorf("Unexpected error: %v", err)
			}
			var handler http.Handler
			handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				got := reflect.TypeOf(LogOf(r, w)).String()
				if test.want != got {
					t.Errorf("Expected %v, got %v", test.want, got)
				}
			})
			handler = withLogging(handler, DefaultStacktracePred, func() bool { return test.shouldLogRequest })

			Name:   username,
			Groups: groups,
			Extra:  userExtra,
			UID:    uid,
		}
		req = req.WithContext(request.WithUser(ctx, newUser))

		oldUser, _ := request.UserFrom(ctx)
		httplog.LogOf(req, w).Addf("%v is impersonating %v", userString(oldUser), userString(newUser))

		ae := audit.AuditEventFrom(ctx)
		audit.LogImpersonatedUser(ae, newUser)

		// clear all the impersonation headers from the request