API Reference > frontend-authorization-client > BrowserAuthorization > BrowserAuthorizationCallbackHandlerConfiguration > responseMode responseMode responseMode: undefined | string Depending upon the mechanism used to authenticate, the signin response may be delivered in either the URL query or fragment strings. If left undefined, the callback handler will check the URL fragment by default. Authorization code responses are expected to be delivered in the query string, while access tokens are delivered via the fragment. Sign-OUT responses are always expected to be delivered in the query string. Defined in frontend-authorization/src/oidc/browser/BrowserAuthorizationCallbackHandler.ts Line 26 Last Updated: 29 November, 2022