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Java example source code file (OperatorConnectDirect.java)

This example source code file (OperatorConnectDirect.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

basichttpcontext, basichttpparams, basichttprequest, defaultclientconnectionoperator, exception, httpcontext, httphost, httprequest, httpresponse, operatedclientconnection, operatorconnectdirect, options, schemeregistry, socketfactory

The OperatorConnectDirect.java example source code

 * ====================================================================
 * 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
 * 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
 * <http://www.apache.org/>.

package org.apache.http.examples.conn;

import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.conn.ClientConnectionOperator;
import org.apache.http.conn.OperatedClientConnection;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.scheme.SocketFactory;
import org.apache.http.impl.conn.DefaultClientConnectionOperator;
import org.apache.http.message.BasicHttpRequest;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.BasicHttpContext;

 * How to open a direct connection using
 * {@link ClientConnectionOperator ClientConnectionOperator}.
 * This exemplifies the <i>opening of the connection only.
 * The subsequent message exchange in this example should not
 * be used as a template.
 * @since 4.0
public class OperatorConnectDirect {

    public static void main(String[] args) throws Exception {
        HttpHost target = new HttpHost("jakarta.apache.org", 80, "http");

        // some general setup
        // Register the "http" protocol scheme, it is required
        // by the default operator to look up socket factories.
        SchemeRegistry supportedSchemes = new SchemeRegistry();
        SocketFactory sf = PlainSocketFactory.getSocketFactory();
        supportedSchemes.register(new Scheme("http", sf, 80));

        // Prepare parameters.
        // Since this example doesn't use the full core framework,
        // only few parameters are actually required.
        HttpParams params = new BasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setUseExpectContinue(params, false);

        // one operator can be used for many connections
        ClientConnectionOperator scop = new DefaultClientConnectionOperator(supportedSchemes);

        HttpRequest req = new BasicHttpRequest("OPTIONS", "*", HttpVersion.HTTP_1_1);
        req.addHeader("Host", target.getHostName());
        HttpContext ctx = new BasicHttpContext();

        OperatedClientConnection conn = scop.createConnection();
        try {
            System.out.println("opening connection to " + target);
            scop.openConnection(conn, target, null, ctx, params);
            System.out.println("sending request");
            // there is no request entity

            System.out.println("receiving response header");
            HttpResponse rsp = conn.receiveResponseHeader();

            Header[] headers = rsp.getAllHeaders();
            for (int i = 0; i < headers.length; i++) {
        } finally {
            System.out.println("closing connection");


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