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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib;
import java.io.IOException;
import ch.boye.httpclientandroidlib.protocol.HttpContext;
/**
* HTTP protocol interceptor is a routine that implements a specific aspect of
* the HTTP protocol. Usually protocol interceptors are expected to act upon
* one specific header or a group of related headers of the incoming message
* or populate the outgoing message with one specific header or a group of
* related headers.
* <p>
* Protocol Interceptors can also manipulate content entities enclosed with messages.
* Usually this is accomplished by using the 'Decorator' pattern where a wrapper
* entity class is used to decorate the original entity.
* <p>
* Protocol interceptors must be implemented as thread-safe. Similarly to
* servlets, protocol interceptors should not use instance variables unless
* access to those variables is synchronized.
*
* @since 4.0
*/
public interface HttpRequestInterceptor {
/**
* Processes a request.
* On the client side, this step is performed before the request is
* sent to the server. On the server side, this step is performed
* on incoming messages before the message body is evaluated.
*
* @param request the request to preprocess
* @param context the context for the request
*
* @throws HttpException in case of an HTTP protocol violation
* @throws IOException in case of an I/O error
*/
void process(HttpRequest request, HttpContext context)
throws HttpException, IOException;
}
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