针对HttpClient 重写 HttpRequestRetryHandler针对特定异常 增加重试

调用方法：
  public static String doGet(String url) {
        try {
            RequestConfig defaultRequestConfig = RequestConfig.custom()
                    .setSocketTimeout(200)
                    .setConnectTimeout(200)
                    .setConnectionRequestTimeout(200)
                    .build();
            CloseableHttpClient httpclient = HttpClients.custom()
                    .setDefaultRequestConfig(defaultRequestConfig)
                    .setRetryHandler(retryHandler())
                    .build();
            return httpGetString(url, httpclient);
        } catch (IOException e) {
            logger.warn("doGetTimeoutUrl:" + url, e);
            return "";
        }
    }

    /**
     * 从写重试handler
     * @return
     */
    private static HttpRequestRetryHandler retryHandler(){
        return (exception, executionCount, context) -> {
            logger.warn("tryRequest: " + executionCount,exception);
            if (executionCount >= 3) {
                // Do not retry if over max retry count
                return false;
            }
            if (exception instanceof InterruptedIOException) {
                // Timeout
                return true;
            }
            if (exception instanceof UnknownHostException) {
                // Unknown host
                return true;
            }
            if (exception instanceof SSLException) {
                // SSL handshake exception
                return true;
            }
            HttpClientContext clientContext = HttpClientContext.adapt(context);
            HttpRequest request = clientContext.getRequest();
            boolean idempotent = !(request instanceof HttpEntityEnclosingRequest);
            if (idempotent) {
                // Retry if the request is considered idempotent
                return true;
            }
            return false;
        };
    }