HttpComponents Client Source Code Files

HttpComponents Client Source Code Files are provided in the source package file,

You can download as described in the previous tutorial and go to the "httpclient5/src" sub-folder to view Source Code files.

You can also browse HttpComponents Client Source Code below:



 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <>.

package org.apache.hc.client5.http.impl.classic;


import org.apache.hc.client5.http.ConnectionKeepAliveStrategy;
import org.apache.hc.client5.http.HttpRoute;
import org.apache.hc.client5.http.UserTokenHandler;
import org.apache.hc.client5.http.classic.ExecChain;
import org.apache.hc.client5.http.classic.ExecChainHandler;
import org.apache.hc.client5.http.classic.ExecRuntime;
import org.apache.hc.client5.http.impl.ConnectionShutdownException;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.Internal;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.ConnectionReuseStrategy;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.message.RequestLine;
import org.apache.hc.core5.http.protocol.HttpCoreContext;
import org.apache.hc.core5.http.protocol.HttpProcessor;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.TimeValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

 * Usually the last request execution handler in the classic request execution
 * chain that is responsible for execution of request / response exchanges with
 * the opposite endpoint.
 * @since 4.3
@Contract(threading = ThreadingBehavior.STATELESS)
public final class MainClientExec implements ExecChainHandler {

    private static final Logger LOG = LoggerFactory.getLogger(MainClientExec.class);

    private final HttpClientConnectionManager connectionManager;
    private final HttpProcessor httpProcessor;
    private final ConnectionReuseStrategy reuseStrategy;
    private final ConnectionKeepAliveStrategy keepAliveStrategy;
    private final UserTokenHandler userTokenHandler;

     * @since 4.4
    public MainClientExec(
            final HttpClientConnectionManager connectionManager,
            final HttpProcessor httpProcessor,
            final ConnectionReuseStrategy reuseStrategy,
            final ConnectionKeepAliveStrategy keepAliveStrategy,
            final UserTokenHandler userTokenHandler) {
        this.connectionManager = Args.notNull(connectionManager, "Connection manager");
        this.httpProcessor = Args.notNull(httpProcessor, "HTTP protocol processor");
        this.reuseStrategy = Args.notNull(reuseStrategy, "Connection reuse strategy");
        this.keepAliveStrategy = Args.notNull(keepAliveStrategy, "Connection keep alive strategy");
        this.userTokenHandler = Args.notNull(userTokenHandler, "User token handler");

    public ClassicHttpResponse execute(
            final ClassicHttpRequest request,
            final ExecChain.Scope scope,
            final ExecChain chain) throws IOException, HttpException {
        Args.notNull(request, "HTTP request");
        Args.notNull(scope, "Scope");
        final String exchangeId = scope.exchangeId;
        final HttpRoute route = scope.route;
        final HttpClientContext context = scope.clientContext;
        final ExecRuntime execRuntime = scope.execRuntime;

        if (LOG.isDebugEnabled()) {
            LOG.debug("{} executing {}", exchangeId, new RequestLine(request));
        try {
            // Run request protocol interceptors
            context.setAttribute(HttpClientContext.HTTP_ROUTE, route);
            context.setAttribute(HttpCoreContext.HTTP_REQUEST, request);

            httpProcessor.process(request, request.getEntity(), context);

            final ClassicHttpResponse response = execRuntime.execute(exchangeId, request, context);

            context.setAttribute(HttpCoreContext.HTTP_RESPONSE, response);
            httpProcessor.process(response, response.getEntity(), context);

            Object userToken = context.getUserToken();
            if (userToken == null) {
                userToken = userTokenHandler.getUserToken(route, request, context);
                context.setAttribute(HttpClientContext.USER_TOKEN, userToken);

            // The connection is in or can be brought to a re-usable state.
            if (reuseStrategy.keepAlive(request, response, context)) {
                // Set the idle duration of this connection
                final TimeValue duration = keepAliveStrategy.getKeepAliveDuration(response, context);
                if (LOG.isDebugEnabled()) {
                    final String s;
                    if (duration != null) {
                        s = "for " + duration;
                    } else {
                        s = "indefinitely";
                    LOG.debug("{} connection can be kept alive {}", exchangeId, s);
                execRuntime.markConnectionReusable(userToken, duration);
            } else {
            // check for entity, release connection if possible
            final HttpEntity entity = response.getEntity();
            if (entity == null || !entity.isStreaming()) {
                // connection not needed and (assumed to be) in re-usable state
                return new CloseableHttpResponse(response, null);
            return new CloseableHttpResponse(response, execRuntime);
        } catch (final ConnectionShutdownException ex) {
            final InterruptedIOException ioex = new InterruptedIOException(
                    "Connection has been shut down");
            throw ioex;
        } catch (final HttpException | RuntimeException | IOException ex) {
            throw ex;
        } catch (final Error error) {
            throw error;




Or download all them as a single archive file:

File name:
File size: 625318 bytes
Release date: 2022-11-10


Download and Install HttpComponents Core Binary Package

Download and Install HttpComponents Client Source Package

Download and Review Apache HttpComponents-*.jar

⇑⇑ FAQ for Apache HttpComponents JAR Library

2023-03-26, 18275👍, 1💬