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    1   /*
    2    * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/httpcore/tags/4.0.1/httpcore/src/main/java/org/apache/http/protocol/RequestTargetHost.java $
    3    * $Revision: 781114 $
    4    * $Date: 2009-06-02 20:23:51 +0200 (Tue, 02 Jun 2009) $
    5    *
    6    * ====================================================================
    7    * Licensed to the Apache Software Foundation (ASF) under one
    8    * or more contributor license agreements.  See the NOTICE file
    9    * distributed with this work for additional information
   10    * regarding copyright ownership.  The ASF licenses this file
   11    * to you under the Apache License, Version 2.0 (the
   12    * "License"); you may not use this file except in compliance
   13    * with the License.  You may obtain a copy of the License at
   14    *
   15    *   http://www.apache.org/licenses/LICENSE-2.0
   16    *
   17    * Unless required by applicable law or agreed to in writing,
   18    * software distributed under the License is distributed on an
   19    * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   20    * KIND, either express or implied.  See the License for the
   21    * specific language governing permissions and limitations
   22    * under the License.
   23    * ====================================================================
   24    *
   25    * This software consists of voluntary contributions made by many
   26    * individuals on behalf of the Apache Software Foundation.  For more
   27    * information on the Apache Software Foundation, please see
   28    * <http://www.apache.org/>.
   29    *
   30    */
   31   
   32   package org.apache.http.protocol;
   33   
   34   import java.io.IOException;
   35   import java.net.InetAddress;
   36   
   37   import org.apache.http.HttpConnection;
   38   import org.apache.http.HttpException;
   39   import org.apache.http.HttpHost;
   40   import org.apache.http.HttpInetConnection;
   41   import org.apache.http.HttpRequest;
   42   import org.apache.http.HttpRequestInterceptor;
   43   import org.apache.http.HttpVersion;
   44   import org.apache.http.ProtocolVersion;
   45   import org.apache.http.ProtocolException;
   46   
   47   /**
   48    * RequestTargetHost is responsible for adding <code>Host</code> header. This 
   49    * interceptor is required for client side protocol processors. 
   50    *
   51    *
   52    * @version $Revision: 781114 $
   53    * 
   54    * @since 4.0
   55    */
   56   public class RequestTargetHost implements HttpRequestInterceptor {
   57   
   58       public RequestTargetHost() {
   59           super();
   60       }
   61       
   62       public void process(final HttpRequest request, final HttpContext context) 
   63               throws HttpException, IOException {
   64           if (request == null) {
   65               throw new IllegalArgumentException("HTTP request may not be null");
   66           }
   67           if (context == null) {
   68               throw new IllegalArgumentException("HTTP context may not be null");
   69           }
   70           
   71           ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
   72           String method = request.getRequestLine().getMethod();
   73           if (method.equalsIgnoreCase("CONNECT") && ver.lessEquals(HttpVersion.HTTP_1_0)) {
   74               return;
   75           }
   76           
   77           if (!request.containsHeader(HTTP.TARGET_HOST)) {
   78               HttpHost targethost = (HttpHost) context
   79                   .getAttribute(ExecutionContext.HTTP_TARGET_HOST);
   80               if (targethost == null) {
   81                   HttpConnection conn = (HttpConnection) context
   82                       .getAttribute(ExecutionContext.HTTP_CONNECTION);
   83                   if (conn instanceof HttpInetConnection) {
   84                       // Populate the context with a default HTTP host based on the 
   85                       // inet address of the target host
   86                       InetAddress address = ((HttpInetConnection) conn).getRemoteAddress();
   87                       int port = ((HttpInetConnection) conn).getRemotePort();
   88                       if (address != null) {
   89                           targethost = new HttpHost(address.getHostName(), port);
   90                       }
   91                   }
   92                   if (targethost == null) {
   93                       if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
   94                           return;
   95                       } else {
   96                           throw new ProtocolException("Target host missing");
   97                       }
   98                   }
   99               }
  100               request.addHeader(HTTP.TARGET_HOST, targethost.toHostString());
  101           }
  102       }
  103       
  104   }

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