In the process of using httpclient for interface testing, I did not take into account the failure of request auto-retry before, but sometimes I need to retry when some errors occur, such as timeout, frequent rejection of response, etc. After reading the official examples, I wrote a controller for auto-retry.Share the code for your reference.

Here's how to get a controller:

    /**
     * Get Retry Controller
     *
     * @return
     */
    private static HttpRequestRetryHandler getHttpRequestRetryHandler() {
        return new HttpRequestRetryHandler() {
            public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
                logger.warn("An error occurred in the request!", exception);
                if (executionCount > HttpClientConstant.TRY_TIMES) return false;
                if (exception instanceof NoHttpResponseException) {
                    logger.warn("No response exception");
                    sleep(1);
                    return true;
                } else if (exception instanceof ConnectTimeoutException) {
                    logger.warn("Connection timed out, retry");
                    sleep(5);
                    return true;
                } else if (exception instanceof SSLHandshakeException) {
                    logger.warn("Local Certificate Exception");
                    return false;
                } else if (exception instanceof InterruptedIOException) {
                    logger.warn("IO Interrupt exception");
                    sleep(1);
                    return true;
                } else if (exception instanceof UnknownHostException) {
                    logger.warn("Server exception not found");
                    return false;
                } else if (exception instanceof SSLException) {
                    logger.warn("SSL abnormal");
                    return false;
                } else if (exception instanceof HttpHostConnectException) {
                    logger.warn("Host Connection Exception");
                    return false;
                } else if (exception instanceof SocketException) {
                    logger.warn("socket abnormal");
                    return false;
                } else {
                    logger.warn("Unrecorded request exception:{}", exception.getClass());
                }
                HttpClientContext clientContext = HttpClientContext.adapt(context);
                HttpRequest request = clientContext.getRequest();
                // If the request is idempotent, try again
                if (!(request instanceof HttpEntityEnclosingRequest)) {
                    sleep(2);
                    return true;
                }
                return false;
            }
        };
    }

This time-out and number of retries are used as a basis for determining whether an interface request failed.Here are the controller setup methods:

	 /**
     * Get https protocol request object through connection pool
     * <p>
     * Increase the default request controller, request configuration, connect the controller, cancel the cookiestore, separate resolve the header that responds to set-cookie s and sends requests, adapting to situations where multiple users are online at the same time
     * </p>
     *
     * @return
     */
    private static CloseableHttpClient getCloseableHttpsClients() {
        // Create a custom httpsclient object
        CloseableHttpClient client = HttpClients.custom().setConnectionManager(connManager).setRetryHandler(httpRequestRetryHandler).setDefaultRequestConfig(requestConfig).build();
//         CloseableHttpClient client = HttpClients.createDefault(); //Non-connection pool creation
        return client;
    }

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