public static String casOAuthCallbackUrl(final String serverPrefixUrl) {
        return serverPrefixUrl.concat(OAuth20Constants.BASE_OAUTH20_URL + '/' + OAuth20Constants.CALLBACK_AUTHORIZE_URL);
    }
CAS oauth callback url.

@param serverPrefixUrl the server prefix url
@return the string
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/util/OAuth20Utils.java