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/*
 * ====================================================================
 * 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.hc.client5.http.impl;

import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.Method;
import org.apache.hc.core5.http.impl.DefaultConnectionReuseStrategy;
import org.apache.hc.core5.http.protocol.HttpContext;

/**
 * Extension of core {@link DefaultConnectionReuseStrategy} that treats
 * CONNECT method exchanges involved in proxy tunnelling as a special case.
 *
 * @since 5.2
 */
@Contract(threading = ThreadingBehavior.STATELESS)
public class DefaultClientConnectionReuseStrategy extends DefaultConnectionReuseStrategy {

    /**
     * Default instance of {@link DefaultClientConnectionReuseStrategy}.
     */
    public static final DefaultClientConnectionReuseStrategy INSTANCE = new DefaultClientConnectionReuseStrategy();

    @Override
    public boolean keepAlive(final HttpRequest request, final HttpResponse response, final HttpContext context) {
        if (Method.CONNECT.isSame(request.getMethod()) && response.getCode() == HttpStatus.SC_OK) {
            return true;
        }
        return super.keepAlive(request, response, context);
    }

}