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Apache HttpComponents AsyncClient
There is a newer version: 4.1.5
/*
 * ====================================================================
 * 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
 *
 *   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.
 * ====================================================================
 *
 * 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.http.impl.nio.client;

import org.apache.http.HttpVersion;
import org.apache.http.client.protocol.RequestAddCookies;
import org.apache.http.client.protocol.RequestAuthCache;
import org.apache.http.client.protocol.RequestClientConnControl;
import org.apache.http.client.protocol.RequestDefaultHeaders;
import org.apache.http.client.protocol.RequestProxyAuthentication;
import org.apache.http.client.protocol.RequestTargetAuthentication;
import org.apache.http.client.protocol.ResponseProcessCookies;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.nio.reactor.IOReactorConfig;
import org.apache.http.nio.conn.ClientAsyncConnectionManager;
import org.apache.http.nio.reactor.IOReactorException;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.params.SyncBasicHttpParams;
import org.apache.http.protocol.BasicHttpProcessor;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.RequestContent;
import org.apache.http.protocol.RequestExpectContinue;
import org.apache.http.protocol.RequestTargetHost;
import org.apache.http.protocol.RequestUserAgent;
import org.apache.http.util.VersionInfo;

public class DefaultHttpAsyncClient extends AbstractHttpAsyncClient {

    public DefaultHttpAsyncClient(final ClientAsyncConnectionManager connmgr) {
        super(connmgr);
    }

    public DefaultHttpAsyncClient(final IOReactorConfig config) throws IOReactorException {
        super(config);
    }

    public DefaultHttpAsyncClient() throws IOReactorException {
        super(new IOReactorConfig());
    }

    @Override
    protected HttpParams createHttpParams() {
        HttpParams params = new SyncBasicHttpParams();
        setDefaultHttpParams(params);
        return params;
    }

    public static void setDefaultHttpParams(HttpParams params) {
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, HTTP.DEF_CONTENT_CHARSET.name());
        HttpConnectionParams.setTcpNoDelay(params, true);
        HttpConnectionParams.setSocketBufferSize(params, 8192);

        // determine the release version from packaged version info
        final VersionInfo vi = VersionInfo.loadVersionInfo
            ("org.apache.http.nio.client", DefaultHttpClient.class.getClassLoader());
        final String release = (vi != null) ?
            vi.getRelease() : VersionInfo.UNAVAILABLE;
        HttpProtocolParams.setUserAgent(params,
                "Apache-HttpAsyncClient/" + release + " (java 1.5)");
    }

    @Override
    protected BasicHttpProcessor createHttpProcessor() {
        BasicHttpProcessor httpproc = new BasicHttpProcessor();
        httpproc.addInterceptor(new RequestDefaultHeaders());
        // Required protocol interceptors
        httpproc.addInterceptor(new RequestContent());
        httpproc.addInterceptor(new RequestTargetHost());
        // Recommended protocol interceptors
        httpproc.addInterceptor(new RequestClientConnControl());
        httpproc.addInterceptor(new RequestUserAgent());
        httpproc.addInterceptor(new RequestExpectContinue());
        // HTTP state management interceptors
        httpproc.addInterceptor(new RequestAddCookies());
        httpproc.addInterceptor(new ResponseProcessCookies());
        // HTTP authentication interceptors
        httpproc.addInterceptor(new RequestAuthCache());
        httpproc.addInterceptor(new RequestTargetAuthentication());
        httpproc.addInterceptor(new RequestProxyAuthentication());
        return httpproc;
    }

}