michael@0: /*
michael@0:  * ====================================================================
michael@0:  * Licensed to the Apache Software Foundation (ASF) under one
michael@0:  * or more contributor license agreements.  See the NOTICE file
michael@0:  * distributed with this work for additional information
michael@0:  * regarding copyright ownership.  The ASF licenses this file
michael@0:  * to you under the Apache License, Version 2.0 (the
michael@0:  * "License"); you may not use this file except in compliance
michael@0:  * with the License.  You may obtain a copy of the License at
michael@0:  *
michael@0:  *   http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing,
michael@0:  * software distributed under the License is distributed on an
michael@0:  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
michael@0:  * KIND, either express or implied.  See the License for the
michael@0:  * specific language governing permissions and limitations
michael@0:  * under the License.
michael@0:  * ====================================================================
michael@0:  *
michael@0:  * This software consists of voluntary contributions made by many
michael@0:  * individuals on behalf of the Apache Software Foundation.  For more
michael@0:  * information on the Apache Software Foundation, please see
michael@0:  * <http://www.apache.org/>.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: package ch.boye.httpclientandroidlib.protocol;
michael@0: 
michael@0: import java.io.IOException;
michael@0: 
michael@0: import ch.boye.httpclientandroidlib.Header;
michael@0: import ch.boye.httpclientandroidlib.HttpEntity;
michael@0: import ch.boye.httpclientandroidlib.HttpException;
michael@0: import ch.boye.httpclientandroidlib.HttpRequest;
michael@0: import ch.boye.httpclientandroidlib.HttpResponse;
michael@0: import ch.boye.httpclientandroidlib.HttpResponseInterceptor;
michael@0: import ch.boye.httpclientandroidlib.HttpStatus;
michael@0: import ch.boye.httpclientandroidlib.HttpVersion;
michael@0: import ch.boye.httpclientandroidlib.ProtocolVersion;
michael@0: 
michael@0: /**
michael@0:  * ResponseConnControl is responsible for adding <code>Connection</code> header
michael@0:  * to the outgoing responses, which is essential for managing persistence of
michael@0:  * <code>HTTP/1.0</code> connections. This interceptor is recommended for
michael@0:  * server side protocol processors.
michael@0:  *
michael@0:  * @since 4.0
michael@0:  */
michael@0: public class ResponseConnControl implements HttpResponseInterceptor {
michael@0: 
michael@0:     public ResponseConnControl() {
michael@0:         super();
michael@0:     }
michael@0: 
michael@0:     public void process(final HttpResponse response, final HttpContext context)
michael@0:             throws HttpException, IOException {
michael@0:         if (response == null) {
michael@0:             throw new IllegalArgumentException("HTTP response may not be null");
michael@0:         }
michael@0:         if (context == null) {
michael@0:             throw new IllegalArgumentException("HTTP context may not be null");
michael@0:         }
michael@0:         // Always drop connection after certain type of responses
michael@0:         int status = response.getStatusLine().getStatusCode();
michael@0:         if (status == HttpStatus.SC_BAD_REQUEST ||
michael@0:                 status == HttpStatus.SC_REQUEST_TIMEOUT ||
michael@0:                 status == HttpStatus.SC_LENGTH_REQUIRED ||
michael@0:                 status == HttpStatus.SC_REQUEST_TOO_LONG ||
michael@0:                 status == HttpStatus.SC_REQUEST_URI_TOO_LONG ||
michael@0:                 status == HttpStatus.SC_SERVICE_UNAVAILABLE ||
michael@0:                 status == HttpStatus.SC_NOT_IMPLEMENTED) {
michael@0:             response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
michael@0:             return;
michael@0:         }
michael@0:         // Always drop connection for HTTP/1.0 responses and below
michael@0:         // if the content body cannot be correctly delimited
michael@0:         HttpEntity entity = response.getEntity();
michael@0:         if (entity != null) {
michael@0:             ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
michael@0:             if (entity.getContentLength() < 0 &&
michael@0:                     (!entity.isChunked() || ver.lessEquals(HttpVersion.HTTP_1_0))) {
michael@0:                 response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
michael@0:                 return;
michael@0:             }
michael@0:         }
michael@0:         // Drop connection if requested by the client
michael@0:         HttpRequest request = (HttpRequest)
michael@0:             context.getAttribute(ExecutionContext.HTTP_REQUEST);
michael@0:         if (request != null) {
michael@0:             Header header = request.getFirstHeader(HTTP.CONN_DIRECTIVE);
michael@0:             if (header != null) {
michael@0:                 response.setHeader(HTTP.CONN_DIRECTIVE, header.getValue());
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0: }