public String getSuccessUrl() {
        return successUrl;
    }
Returns the 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}.

@return the success url to use as the default location a user is sent after logging in.
web/src/main/java/org/apache/shiro/web/filter/authc/AuthenticationFilter.java