How to get "RetryAfter" header from Response when exception thrown with 429

[KitGavinx]

After reading the following source code, I found that in the response, I could not get the "RetryAfter" response header. This information is quite important. Can you add it?

When the "handleErrorResponse" exception is thrown, I hope to bring this information. Of course, if there are other better ways, that's fine too.

`

public static String handleResponse(Request request, boolean showLimitUsage, ProxyAuth proxy) {
        client = HttpClientSingleton.getHttpClient(proxy);
        try (Response response = client.newCall(request).execute()) {
            if (null == response) {
                throw new BinanceServerException("[ResponseHandler] No response from server");
            }

            String responseAsString = getResponseBodyAsString(response.body());

            if (response.code() >= HTTP_STATUS_CODE_400 && response.code() <= HTTP_STATUS_CODE_499) {
                throw handleErrorResponse(responseAsString, response.code());
            } else if (response.code() >= HTTP_STATUS_CODE_500) {
                throw new BinanceServerException(responseAsString, response.code());
            }

            if (showLimitUsage) {
                return getLimitUsage(response, responseAsString);
            } else {
                return responseAsString;
            }
        } catch (IOException | IllegalStateException e) {
            String exceptionMsg = "OKHTTP Error: ";
            if (proxy != null) {
                if ((e.getClass().equals(ConnectException.class))) {
                    exceptionMsg = "Proxy Connection Error: ";
                } else if ((e.getClass().equals(UnknownHostException.class))) {
                    exceptionMsg = "Proxy Unknown Host Error: ";
                }
            }
            throw new BinanceConnectorException("[ResponseHandler] " + exceptionMsg + e.getMessage());
        }
    }