michael@0: /*
michael@0:  * ====================================================================
michael@0:  * Licensed to the Apache Software Foundation (ASF) under one
michael@0:  * or more contributor license agreements.  See the NOTICE file
michael@0:  * distributed with this work for additional information
michael@0:  * regarding copyright ownership.  The ASF licenses this file
michael@0:  * to you under the Apache License, Version 2.0 (the
michael@0:  * "License"); you may not use this file except in compliance
michael@0:  * with the License.  You may obtain a copy of the License at
michael@0:  *
michael@0:  *   http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing,
michael@0:  * software distributed under the License is distributed on an
michael@0:  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
michael@0:  * KIND, either express or implied.  See the License for the
michael@0:  * specific language governing permissions and limitations
michael@0:  * under the License.
michael@0:  * ====================================================================
michael@0:  *
michael@0:  * This software consists of voluntary contributions made by many
michael@0:  * individuals on behalf of the Apache Software Foundation.  For more
michael@0:  * information on the Apache Software Foundation, please see
michael@0:  * <http://www.apache.org/>.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: package ch.boye.httpclientandroidlib.client.protocol;
michael@0: 
michael@0: import java.io.IOException;
michael@0: 
michael@0: import ch.boye.httpclientandroidlib.androidextra.HttpClientAndroidLog;
michael@0: /* LogFactory removed by HttpClient for Android script. */
michael@0: import ch.boye.httpclientandroidlib.annotation.Immutable;
michael@0: 
michael@0: import ch.boye.httpclientandroidlib.HttpException;
michael@0: import ch.boye.httpclientandroidlib.HttpRequest;
michael@0: import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
michael@0: import ch.boye.httpclientandroidlib.conn.HttpRoutedConnection;
michael@0: import ch.boye.httpclientandroidlib.conn.routing.HttpRoute;
michael@0: import ch.boye.httpclientandroidlib.protocol.ExecutionContext;
michael@0: import ch.boye.httpclientandroidlib.protocol.HTTP;
michael@0: import ch.boye.httpclientandroidlib.protocol.HttpContext;
michael@0: 
michael@0: /**
michael@0:  * This protocol interceptor is responsible for adding <code>Connection</code>
michael@0:  * or <code>Proxy-Connection</code> headers to the outgoing requests, which
michael@0:  * is essential for managing persistence of <code>HTTP/1.0</code> connections.
michael@0:  *
michael@0:  * @since 4.0
michael@0:  */
michael@0: @Immutable
michael@0: public class RequestClientConnControl implements HttpRequestInterceptor {
michael@0: 
michael@0:     public HttpClientAndroidLog log = new HttpClientAndroidLog(getClass());
michael@0: 
michael@0:     private static final String PROXY_CONN_DIRECTIVE = "Proxy-Connection";
michael@0: 
michael@0:     public RequestClientConnControl() {
michael@0:         super();
michael@0:     }
michael@0: 
michael@0:     public void process(final HttpRequest request, final HttpContext context)
michael@0:             throws HttpException, IOException {
michael@0:         if (request == null) {
michael@0:             throw new IllegalArgumentException("HTTP request may not be null");
michael@0:         }
michael@0: 
michael@0:         String method = request.getRequestLine().getMethod();
michael@0:         if (method.equalsIgnoreCase("CONNECT")) {
michael@0:             request.setHeader(PROXY_CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         // Obtain the client connection (required)
michael@0:         HttpRoutedConnection conn = (HttpRoutedConnection) context.getAttribute(
michael@0:                 ExecutionContext.HTTP_CONNECTION);
michael@0:         if (conn == null) {
michael@0:             this.log.debug("HTTP connection not set in the context");
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         HttpRoute route = conn.getRoute();
michael@0: 
michael@0:         if (route.getHopCount() == 1 || route.isTunnelled()) {
michael@0:             if (!request.containsHeader(HTTP.CONN_DIRECTIVE)) {
michael@0:                 request.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
michael@0:             }
michael@0:         }
michael@0:         if (route.getHopCount() == 2 && !route.isTunnelled()) {
michael@0:             if (!request.containsHeader(PROXY_CONN_DIRECTIVE)) {
michael@0:                 request.addHeader(PROXY_CONN_DIRECTIVE, HTTP.CONN_KEEP_ALIVE);
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0: }