public Element requestSecurityTokenResponse(final String appliesTo, final String action,
                                                final String requestType, final SecurityToken target) throws Exception {
        val response = issue(appliesTo, action, "/Issue", null);
        return getDocumentElement(response.getResponse());
    }
Request security token response element.

@param appliesTo   the applies to
@param action      the action
@param requestType the request type
@param target      the target
@return the element
@throws Exception the exception
support/cas-server-support-ws-sts-api/src/main/java/org/apereo/cas/authentication/SecurityTokenServiceClient.java