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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
* .
*
*/
package org.apache.http.protocol;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
/**
* Defines an interface to verify whether an incoming HTTP request meets
* the target server's expectations.
*
* The Expect request-header field is used to indicate that particular
* server behaviors are required by the client.
*
*
* Expect = "Expect" ":" 1#expectation
*
* expectation = "100-continue" | expectation-extension
* expectation-extension = token [ "=" ( token | quoted-string )
* *expect-params ]
* expect-params = ";" token [ "=" ( token | quoted-string ) ]
*
*
* A server that does not understand or is unable to comply with any of
* the expectation values in the Expect field of a request MUST respond
* with appropriate error status. The server MUST respond with a 417
* (Expectation Failed) status if any of the expectations cannot be met
* or, if there are other problems with the request, some other 4xx
* status.
*
*
* @since 4.0
*/
public interface HttpExpectationVerifier {
/**
* Verifies whether the given request meets the server's expectations.
*
* If the request fails to meet particular criteria, this method can
* trigger a terminal response back to the client by setting the status
* code of the response object to a value greater or equal to
* {@code 200}. In this case the client will not have to transmit
* the request body. If the request meets expectations this method can
* terminate without modifying the response object. Per default the status
* code of the response object will be set to {@code 100}.
*
* @param request the HTTP request.
* @param response the HTTP response.
* @param context the HTTP context.
* @throws HttpException in case of an HTTP protocol violation.
*/
void verify(HttpRequest request, HttpResponse response, HttpContext context)
throws HttpException;
}