private boolean isHttpOrHttps(URI uri) {
        return "http".equalsIgnoreCase(uri.getScheme())
             || "https".equalsIgnoreCase(uri.getScheme());
    }
URI to redirect browser to when their account has not yet been approved.
@return redirect URI
sso/keycloak/extensions/src/main/java/io/apiman/manager/sso/keycloak/approval/AccountApprovalOptions.java