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98 lines
4.0 KiB
Java
98 lines
4.0 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.protocol;
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import java.io.IOException;
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import ch.boye.httpclientandroidlib.HttpEntity;
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import ch.boye.httpclientandroidlib.HttpException;
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import ch.boye.httpclientandroidlib.HttpResponse;
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import ch.boye.httpclientandroidlib.HttpResponseInterceptor;
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import ch.boye.httpclientandroidlib.HttpStatus;
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import ch.boye.httpclientandroidlib.HttpVersion;
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import ch.boye.httpclientandroidlib.ProtocolVersion;
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import ch.boye.httpclientandroidlib.ProtocolException;
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/**
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* ResponseContent is the most important interceptor for outgoing responses.
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* It is responsible for delimiting content length by adding
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* <code>Content-Length</code> or <code>Transfer-Content</code> headers based
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* on the properties of the enclosed entity and the protocol version.
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* This interceptor is required for correct functioning of server side protocol
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* processors.
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*
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* @since 4.0
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*/
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public class ResponseContent implements HttpResponseInterceptor {
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public ResponseContent() {
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super();
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}
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public void process(final HttpResponse response, final HttpContext context)
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throws HttpException, IOException {
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if (response == null) {
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throw new IllegalArgumentException("HTTP response may not be null");
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}
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if (response.containsHeader(HTTP.TRANSFER_ENCODING)) {
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throw new ProtocolException("Transfer-encoding header already present");
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}
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if (response.containsHeader(HTTP.CONTENT_LEN)) {
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throw new ProtocolException("Content-Length header already present");
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}
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ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
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HttpEntity entity = response.getEntity();
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if (entity != null) {
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long len = entity.getContentLength();
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if (entity.isChunked() && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
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response.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
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} else if (len >= 0) {
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response.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
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}
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// Specify a content type if known
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if (entity.getContentType() != null && !response.containsHeader(
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HTTP.CONTENT_TYPE )) {
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response.addHeader(entity.getContentType());
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}
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// Specify a content encoding if known
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if (entity.getContentEncoding() != null && !response.containsHeader(
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HTTP.CONTENT_ENCODING)) {
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response.addHeader(entity.getContentEncoding());
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}
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} else {
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int status = response.getStatusLine().getStatusCode();
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if (status != HttpStatus.SC_NO_CONTENT
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&& status != HttpStatus.SC_NOT_MODIFIED
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&& status != HttpStatus.SC_RESET_CONTENT) {
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response.addHeader(HTTP.CONTENT_LEN, "0");
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}
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}
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}
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}
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