public void setSuccessUrl(String successUrl) {
        this.successUrl = successUrl;
    }
Sets the default/fallback success url to use as the default location a user is sent after logging in.  Typically
a redirect after login will redirect to the originally request URL; this property is provided mainly as a
fallback in case the original request URL is not available or not specified.
<p/>
The default value is {@link #DEFAULT_SUCCESS_URL}.

@param successUrl the success URL to redirect the user to after a successful login.
web/src/main/java/org/apache/shiro/web/filter/authc/AuthenticationFilter.java