001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.protocol; 029 030import java.io.IOException; 031import java.net.InetAddress; 032 033import org.apache.http.HttpConnection; 034import org.apache.http.HttpException; 035import org.apache.http.HttpHost; 036import org.apache.http.HttpInetConnection; 037import org.apache.http.HttpRequest; 038import org.apache.http.HttpRequestInterceptor; 039import org.apache.http.HttpVersion; 040import org.apache.http.ProtocolException; 041import org.apache.http.ProtocolVersion; 042import org.apache.http.annotation.ThreadingBehavior; 043import org.apache.http.annotation.Contract; 044import org.apache.http.util.Args; 045 046/** 047 * RequestTargetHost is responsible for adding {@code Host} header. This 048 * interceptor is required for client side protocol processors. 049 * 050 * @since 4.0 051 */ 052@Contract(threading = ThreadingBehavior.IMMUTABLE) 053public class RequestTargetHost implements HttpRequestInterceptor { 054 055 public RequestTargetHost() { 056 super(); 057 } 058 059 @Override 060 public void process(final HttpRequest request, final HttpContext context) 061 throws HttpException, IOException { 062 Args.notNull(request, "HTTP request"); 063 064 final HttpCoreContext coreContext = HttpCoreContext.adapt(context); 065 066 final ProtocolVersion ver = request.getRequestLine().getProtocolVersion(); 067 final String method = request.getRequestLine().getMethod(); 068 if (method.equalsIgnoreCase("CONNECT") && ver.lessEquals(HttpVersion.HTTP_1_0)) { 069 return; 070 } 071 072 if (!request.containsHeader(HTTP.TARGET_HOST)) { 073 HttpHost targetHost = coreContext.getTargetHost(); 074 if (targetHost == null) { 075 final HttpConnection conn = coreContext.getConnection(); 076 if (conn instanceof HttpInetConnection) { 077 // Populate the context with a default HTTP host based on the 078 // inet address of the target host 079 final InetAddress address = ((HttpInetConnection) conn).getRemoteAddress(); 080 final int port = ((HttpInetConnection) conn).getRemotePort(); 081 if (address != null) { 082 targetHost = new HttpHost(address.getHostName(), port); 083 } 084 } 085 if (targetHost == null) { 086 if (ver.lessEquals(HttpVersion.HTTP_1_0)) { 087 return; 088 } 089 throw new ProtocolException("Target host missing"); 090 } 091 } 092 request.addHeader(HTTP.TARGET_HOST, targetHost.toHostString()); 093 } 094 } 095 096}