The Tor Browser: mobile/android/thirdparty/ch/boye/httpclientandroidlib/protocol/ResponseContent.java@fc2d59ddac77

     1 /*

     2  * ====================================================================

     3  * Licensed to the Apache Software Foundation (ASF) under one

     4  * or more contributor license agreements.  See the NOTICE file

     5  * distributed with this work for additional information

     6  * regarding copyright ownership.  The ASF licenses this file

     7  * to you under the Apache License, Version 2.0 (the

     8  * "License"); you may not use this file except in compliance

     9  * with the License.  You may obtain a copy of the License at

    10  *

    11  *   http://www.apache.org/licenses/LICENSE-2.0

    12  *

    13  * Unless required by applicable law or agreed to in writing,

    14  * software distributed under the License is distributed on an

    15  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

    16  * KIND, either express or implied.  See the License for the

    17  * specific language governing permissions and limitations

    18  * under the License.

    19  * ====================================================================

    20  *

    21  * This software consists of voluntary contributions made by many

    22  * individuals on behalf of the Apache Software Foundation.  For more

    23  * information on the Apache Software Foundation, please see

    24  * <http://www.apache.org/>.

    25  *

    26  */

    28 package ch.boye.httpclientandroidlib.protocol;

    30 import java.io.IOException;

    32 import ch.boye.httpclientandroidlib.HttpEntity;

    33 import ch.boye.httpclientandroidlib.HttpException;

    34 import ch.boye.httpclientandroidlib.HttpResponse;

    35 import ch.boye.httpclientandroidlib.HttpResponseInterceptor;

    36 import ch.boye.httpclientandroidlib.HttpStatus;

    37 import ch.boye.httpclientandroidlib.HttpVersion;

    38 import ch.boye.httpclientandroidlib.ProtocolVersion;

    39 import ch.boye.httpclientandroidlib.ProtocolException;

    41 /**

    42  * ResponseContent is the most important interceptor for outgoing responses.

    43  * It is responsible for delimiting content length by adding

    44  * <code>Content-Length</code> or <code>Transfer-Content</code> headers based

    45  * on the properties of the enclosed entity and the protocol version.

    46  * This interceptor is required for correct functioning of server side protocol

    47  * processors.

    48  *

    49  * @since 4.0

    50  */

    51 public class ResponseContent implements HttpResponseInterceptor {

    53     public ResponseContent() {

    54         super();

    55     }

    57     public void process(final HttpResponse response, final HttpContext context)

    58             throws HttpException, IOException {

    59         if (response == null) {

    60             throw new IllegalArgumentException("HTTP response may not be null");

    61         }

    62         if (response.containsHeader(HTTP.TRANSFER_ENCODING)) {

    63             throw new ProtocolException("Transfer-encoding header already present");

    64         }

    65         if (response.containsHeader(HTTP.CONTENT_LEN)) {

    66             throw new ProtocolException("Content-Length header already present");

    67         }

    68         ProtocolVersion ver = response.getStatusLine().getProtocolVersion();

    69         HttpEntity entity = response.getEntity();

    70         if (entity != null) {

    71             long len = entity.getContentLength();

    72             if (entity.isChunked() && !ver.lessEquals(HttpVersion.HTTP_1_0)) {

    73                 response.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);

    74             } else if (len >= 0) {

    75                 response.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));

    76             }

    77             // Specify a content type if known

    78             if (entity.getContentType() != null && !response.containsHeader(

    79                     HTTP.CONTENT_TYPE )) {

    80                 response.addHeader(entity.getContentType());

    81             }

    82             // Specify a content encoding if known

    83             if (entity.getContentEncoding() != null && !response.containsHeader(

    84                     HTTP.CONTENT_ENCODING)) {

    85                 response.addHeader(entity.getContentEncoding());

    86             }

    87         } else {

    88             int status = response.getStatusLine().getStatusCode();

    89             if (status != HttpStatus.SC_NO_CONTENT

    90                     && status != HttpStatus.SC_NOT_MODIFIED

    91                     && status != HttpStatus.SC_RESET_CONTENT) {

    92                 response.addHeader(HTTP.CONTENT_LEN, "0");

    93             }

    94         }

    95     }

    97 }

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