/*
* ====================================================================
* 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.
ThreadingBehavior;
import org.apache.http.annotation.
Contract;
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
*/
@
Contract(threading =
ThreadingBehavior.
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);
}
}
}
}