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Twilio Java Helper Library
There is a newer version: 10.1.5
package com.twilio.http;

import org.apache.http.client.RedirectStrategy;
import org.apache.http.impl.client.DefaultRedirectStrategy;

public abstract class HttpClient {

    public static final int ANY_500 = -500;
    public static final int ANY_400 = -400;
    public static final int ANY_300 = -300;
    public static final int ANY_200 = -200;
    public static final int ANY_100 = -100;

    public static final int[] RETRY_CODES = new int[]{ANY_500};
    public static final int RETRIES = 3;
    public static final long DELAY_MILLIS = 100L;

    // Default redirect strategy to not auto-redirect for any methods (empty string array).
    private RedirectStrategy redirectStrategy = new DefaultRedirectStrategy(new String[0]);

    private Response lastResponse;
    private Request lastRequest;

    /**
     * Make a request.
     *
     * @param request request to make
     * @return Response of the HTTP request
     */
    public Response reliableRequest(final Request request) {
        return reliableRequest(request, RETRY_CODES, RETRIES, DELAY_MILLIS);
    }

    /**
     * Make a request.
     *
     * @param request     request to make
     * @param retryCodes  codes used for retries
     * @param retries     max number of retries
     * @param delayMillis delays between retries
     * @return Response of the HTTP request
     */
    public Response reliableRequest(final Request request, final int[] retryCodes, int retries,
                                    final long delayMillis) {
        lastRequest = request;
        Response response = null;
        while (retries > 0) {
            response = makeRequest(request);

            if (!shouldRetry(response, retryCodes)) {
                break;
            }

            try {
                Thread.sleep(delayMillis);
            } catch (final InterruptedException e) {
                // Delay failed, continue
            }

            // Decrement retries
            retries--;
        }

        lastResponse = response;

        return response;
    }

    public Response getLastResponse() {
        return lastResponse;
    }

    public Request getLastRequest() {
        return lastRequest;
    }

    protected boolean shouldRetry(final Response response, final int[] retryCodes) {
        if (response == null) {
            return true;
        }

        int statusCode = response.getStatusCode();
        int category = (int) Math.floor(statusCode / 100.0);

        for (final int retryCode : retryCodes) {
            switch (retryCode) {
                case ANY_100:
                    if (category == 1) {
                        return true;
                    }
                    break;
                case ANY_200:
                    if (category == 2) {
                        return true;
                    }
                    break;
                case ANY_300:
                    if (category == 3) {
                        return true;
                    }
                    break;
                case ANY_400:
                    if (category == 4) {
                        return true;
                    }
                    break;
                case ANY_500:
                    if (category == 5) {
                        return true;
                    }
                    break;
                default:
                    if (statusCode == retryCode) {
                        return true;
                    }
                    break;
            }
        }
        return false;
    }

    public RedirectStrategy getRedirectStrategy() {
        return redirectStrategy;
    }

    public void setRedirectStrategy(final RedirectStrategy redirectStrategy) {
        this.redirectStrategy = redirectStrategy;
    }

    public abstract Response makeRequest(final Request request);
}