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; 031 032import org.apache.http.HttpEntity; 033import org.apache.http.HttpEntityEnclosingRequest; 034import org.apache.http.HttpException; 035import org.apache.http.HttpRequest; 036import org.apache.http.HttpRequestInterceptor; 037import org.apache.http.HttpVersion; 038import org.apache.http.ProtocolException; 039import org.apache.http.ProtocolVersion; 040import org.apache.http.annotation.ThreadingBehavior; 041import org.apache.http.annotation.Contract; 042import org.apache.http.util.Args; 043 044/** 045 * RequestContent is the most important interceptor for outgoing requests. 046 * It is responsible for delimiting content length by adding 047 * {@code Content-Length} or {@code Transfer-Content} headers based 048 * on the properties of the enclosed entity and the protocol version. 049 * This interceptor is required for correct functioning of client side protocol 050 * processors. 051 * 052 * @since 4.0 053 */ 054@Contract(threading = ThreadingBehavior.IMMUTABLE) 055public class RequestContent implements HttpRequestInterceptor { 056 057 private final boolean overwrite; 058 059 /** 060 * Default constructor. The {@code Content-Length} or {@code Transfer-Encoding} 061 * will cause the interceptor to throw {@link ProtocolException} if already present in the 062 * response message. 063 */ 064 public RequestContent() { 065 this(false); 066 } 067 068 /** 069 * Constructor that can be used to fine-tune behavior of this interceptor. 070 * 071 * @param overwrite If set to {@code true} the {@code Content-Length} and 072 * {@code Transfer-Encoding} headers will be created or updated if already present. 073 * If set to {@code false} the {@code Content-Length} and 074 * {@code Transfer-Encoding} headers will cause the interceptor to throw 075 * {@link ProtocolException} if already present in the response message. 076 * 077 * @since 4.2 078 */ 079 public RequestContent(final boolean overwrite) { 080 super(); 081 this.overwrite = overwrite; 082 } 083 084 @Override 085 public void process(final HttpRequest request, final HttpContext context) 086 throws HttpException, IOException { 087 Args.notNull(request, "HTTP request"); 088 if (request instanceof HttpEntityEnclosingRequest) { 089 if (this.overwrite) { 090 request.removeHeaders(HTTP.TRANSFER_ENCODING); 091 request.removeHeaders(HTTP.CONTENT_LEN); 092 } else { 093 if (request.containsHeader(HTTP.TRANSFER_ENCODING)) { 094 throw new ProtocolException("Transfer-encoding header already present"); 095 } 096 if (request.containsHeader(HTTP.CONTENT_LEN)) { 097 throw new ProtocolException("Content-Length header already present"); 098 } 099 } 100 final ProtocolVersion ver = request.getRequestLine().getProtocolVersion(); 101 final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity(); 102 if (entity == null) { 103 request.addHeader(HTTP.CONTENT_LEN, "0"); 104 return; 105 } 106 // Must specify a transfer encoding or a content length 107 if (entity.isChunked() || entity.getContentLength() < 0) { 108 if (ver.lessEquals(HttpVersion.HTTP_1_0)) { 109 throw new ProtocolException( 110 "Chunked transfer encoding not allowed for " + ver); 111 } 112 request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING); 113 } else { 114 request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength())); 115 } 116 // Specify a content type if known 117 if (entity.getContentType() != null && !request.containsHeader( 118 HTTP.CONTENT_TYPE )) { 119 request.addHeader(entity.getContentType()); 120 } 121 // Specify a content encoding if known 122 if (entity.getContentEncoding() != null && !request.containsHeader( 123 HTTP.CONTENT_ENCODING)) { 124 request.addHeader(entity.getContentEncoding()); 125 } 126 } 127 } 128 129}