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
		req.Header.Del(authenticationv1.ImpersonateUserHeader)