Java tutorial
/** * Copyright (c) 2016, Istomin Andrei * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.github.aistomin.http; import java.util.Map; import org.apache.http.HttpResponse; import org.apache.http.client.ServiceUnavailableRetryStrategy; import org.apache.http.client.fluent.Executor; import org.apache.http.client.fluent.Request; import org.apache.http.impl.client.HttpClientBuilder; import org.apache.http.impl.client.LaxRedirectStrategy; import org.apache.http.protocol.HttpContext; /** * HTTP POST Request. * * @author Andrei Istomin (andrej.istomin.ikeen@gmail.com) * @version $Id$ * @since 0.1 */ public final class PostRequest implements HttpRequest { /** * Retries count on HTTP error. */ public static final Integer RETRY_COUNT = 20; /** * Retries interval in milliseconds on HTTP error. */ public static final Integer RETRY_INTERVAL = 100; /** * Request's URL. */ private final transient String resource; /** * Request's headers. */ private final transient Map<String, String> heads; /** * Ctor. * * @param url Request's URL. * @param headers Request's headers. */ public PostRequest(final String url, final Map<String, String> headers) { this.resource = url; this.heads = headers; } @Override public String execute() throws Exception { final Request request = Request.Post(this.resource); for (final Map.Entry<String, String> item : this.heads.entrySet()) { request.addHeader(item.getKey(), item.getValue()); } final HttpClientBuilder builder = HttpClientBuilder.create(); builder.setRedirectStrategy(new LaxRedirectStrategy()); builder.setServiceUnavailableRetryStrategy(new ServiceUnavailableRetryStrategy() { public boolean retryRequest(final HttpResponse response, final int count, final HttpContext context) { return count <= PostRequest.RETRY_COUNT; } public long getRetryInterval() { return PostRequest.RETRY_INTERVAL; } }); return Executor.newInstance(builder.build()).execute(request).returnContent().asString(); } }