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diff --git a/src/org/apache/http/protocol/HttpExpectationVerifier.java b/src/org/apache/http/protocol/HttpExpectationVerifier.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/HttpExpectationVerifier.java $
+ * $Revision: 613298 $
+ * $Date: 2008-01-18 14:09:22 -0800 (Fri, 18 Jan 2008) $
+ *
+ * ====================================================================
+ * 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 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. 
+ *<p>
+ * The Expect request-header field is used to indicate that particular
+ * server behaviors are required by the client.
+ *</p>
+ *<pre>
+ *    Expect       =  "Expect" ":" 1#expectation
+ *
+ *    expectation  =  "100-continue" | expectation-extension
+ *    expectation-extension =  token [ "=" ( token | quoted-string )
+ *                             *expect-params ]
+ *    expect-params =  ";" token [ "=" ( token | quoted-string ) ]
+ *</pre>
+ *<p>
+ * 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.
+ *</p>
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ *
+ * @version $Revision: 613298 $
+ * 
+ * @since 4.0
+ */
+public interface HttpExpectationVerifier {
+
+    void verify(HttpRequest request, HttpResponse response, HttpContext context)
+            throws HttpException;
+    
+}