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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; }





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