/*
* ====================================================================
* 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.http.protocol;
import java.io.IOException;
import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.HttpStatus;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolVersion;
import org.apache.http.annotation.Immutable;
import org.apache.http.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
*/
@Immutable
public class ResponseConnControl implements HttpResponseInterceptor {
public ResponseConnControl() {
super();
}
@Override
public void process(final HttpResponse response, final HttpContext context)
throws HttpException, IOException {
Args.notNull(response, "HTTP response");
final HttpCoreContext corecontext = HttpCoreContext.adapt(context);
// Always drop connection after certain type of responses
final int status = response.getStatusLine().getStatusCode();
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(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
return;
}
final Header explicit = response.getFirstHeader(HTTP.CONN_DIRECTIVE);
if (explicit != null && HTTP.CONN_CLOSE.equalsIgnoreCase(explicit.getValue())) {
// Connection persistence explicitly disabled
return;
}
// Always drop connection for HTTP/1.0 responses and below
// if the content body cannot be correctly delimited
final HttpEntity entity = response.getEntity();
if (entity != null) {
final ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
if (entity.getContentLength() < 0 &&
(!entity.isChunked() || ver.lessEquals(HttpVersion.HTTP_1_0))) {
response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
return;
}
}
// Drop connection if requested by the client or request was <= 1.0
final HttpRequest request = corecontext.getRequest();
if (request != null) {
final Header header = request.getFirstHeader(HTTP.CONN_DIRECTIVE);
if (header != null) {
response.setHeader(HTTP.CONN_DIRECTIVE, header.getValue());
} else if (request.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
}
}
}
}