| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.protocol; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.EntityDetails; |
| import org.apache.hc.core5.http.HeaderElement; |
| import org.apache.hc.core5.http.HeaderElements; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpHeaders; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpResponse; |
| import org.apache.hc.core5.http.HttpResponseInterceptor; |
| import org.apache.hc.core5.http.HttpStatus; |
| import org.apache.hc.core5.http.HttpVersion; |
| import org.apache.hc.core5.http.ProtocolVersion; |
| import org.apache.hc.core5.http.message.MessageSupport; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * ResponseConnControl is responsible for adding {@code Connection} header |
| * to the outgoing responses, which is essential for managing persistence of |
| * {@code HTTP/1.0} connections. This interceptor is recommended for |
| * server side protocol processors. |
| * |
| * @since 4.0 |
| */ |
| @Contract(threading = ThreadingBehavior.IMMUTABLE) |
| public class ResponseConnControl implements HttpResponseInterceptor { |
| |
| public ResponseConnControl() { |
| super(); |
| } |
| |
| @Override |
| public void process(final HttpResponse response, final EntityDetails entity, final HttpContext context) |
| throws HttpException, IOException { |
| Args.notNull(response, "HTTP response"); |
| Args.notNull(context, "HTTP context"); |
| |
| // Always drop connection after certain type of responses |
| final int status = response.getCode(); |
| if (status == HttpStatus.SC_BAD_REQUEST || |
| status == HttpStatus.SC_REQUEST_TIMEOUT || |
| status == HttpStatus.SC_LENGTH_REQUIRED || |
| status == HttpStatus.SC_REQUEST_TOO_LONG || |
| status == HttpStatus.SC_REQUEST_URI_TOO_LONG || |
| status == HttpStatus.SC_SERVICE_UNAVAILABLE || |
| status == HttpStatus.SC_NOT_IMPLEMENTED) { |
| response.setHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE); |
| return; |
| } |
| if (!response.containsHeader(HttpHeaders.CONNECTION)) { |
| // Always drop connection for HTTP/1.0 responses and below |
| // if the content body cannot be correctly delimited |
| final ProtocolVersion ver = context.getProtocolVersion(); |
| if (entity != null && entity.getContentLength() < 0 && ver.lessEquals(HttpVersion.HTTP_1_0)) { |
| response.setHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE); |
| } else { |
| final HttpCoreContext coreContext = HttpCoreContext.adapt(context); |
| final HttpRequest request = coreContext.getRequest(); |
| boolean closeRequested = false; |
| boolean keepAliveRequested = false; |
| if (request != null) { |
| final Iterator<HeaderElement> it = MessageSupport.iterate(request, HttpHeaders.CONNECTION); |
| while (it.hasNext()) { |
| final HeaderElement he = it.next(); |
| if (he.getName().equalsIgnoreCase(HeaderElements.CLOSE)) { |
| closeRequested = true; |
| break; |
| } else if (he.getName().equalsIgnoreCase(HeaderElements.KEEP_ALIVE)) { |
| keepAliveRequested = true; |
| } |
| } |
| } |
| if (closeRequested) { |
| response.addHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE); |
| } else { |
| if (response.containsHeader(HttpHeaders.UPGRADE)) { |
| response.addHeader(HttpHeaders.CONNECTION, HeaderElements.UPGRADE); |
| } else { |
| if (keepAliveRequested) { |
| response.addHeader(HttpHeaders.CONNECTION, HeaderElements.KEEP_ALIVE); |
| } else { |
| if (ver.lessEquals(HttpVersion.HTTP_1_0)) { |
| response.addHeader(HttpHeaders.CONNECTION, HeaderElements.CLOSE); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| } |