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diff --git a/src/org/apache/http/HttpClientConnection.java b/src/org/apache/http/HttpClientConnection.java
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+/*
+ * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/HttpClientConnection.java $
+ * $Revision: 542199 $
+ * $Date: 2007-05-28 04:23:46 -0700 (Mon, 28 May 2007) $
+ *
+ * ====================================================================
+ * 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;
+
+import java.io.IOException;
+
+/**
+ * An HTTP connection for use on the client side.
+ * It is used for sending requests and receiving responses.
+ *
+ * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
+ *
+ *
+ * <!-- empty lines above to avoid 'svn diff' context problems -->
+ * @version $Revision: 542199 $
+ * 
+ * @since 4.0
+ */
+public interface HttpClientConnection extends HttpConnection {
+
+    /**
+     * Checks if response data is available from the connection. May wait for
+     * the specified time until some data becomes available. Note that some
+     * implementations may completely ignore the timeout parameter.
+     * 
+     * @param timeout the maximum time in milliseconds to wait for data
+     * @return true if data is available; false if there was no data available
+     *         even after waiting for <code>timeout</code> milliseconds.
+     * @throws IOException if an error happens on the connection
+     */
+    boolean isResponseAvailable(int timeout) 
+        throws IOException; 
+    
+    /**
+     * Sends the request line and all headers over the connection.
+     * @param request the request whose headers to send.
+     * @throws HttpException 
+     * @throws IOException
+     */
+    void sendRequestHeader(HttpRequest request) 
+        throws HttpException, IOException;
+
+    /**
+     * Sends the request entity over the connection.
+     * @param request the request whose entity to send.
+     * @throws HttpException
+     * @throws IOException
+     */
+    void sendRequestEntity(HttpEntityEnclosingRequest request) 
+        throws HttpException, IOException;
+
+    /**
+     * Receives the request line and headers of the next response available from
+     * this connection. The caller should examine the HttpResponse object to
+     * find out if it should try to receive a response entity as well.
+     * 
+     * @return a new HttpResponse object with status line and headers
+     *         initialized.
+     * @throws HttpException
+     * @throws IOException
+     */
+    HttpResponse receiveResponseHeader() 
+        throws HttpException, IOException;
+
+    /**
+     * Receives the next response entity available from this connection and
+     * attaches it to an existing HttpResponse object.
+     * 
+     * @param response the response to attach the entity to
+     * @throws HttpException
+     * @throws IOException
+     */
+    void receiveResponseEntity(HttpResponse response) 
+        throws HttpException, IOException;
+    
+    /**
+     * Writes out all pending buffered data over the open connection.
+     * 
+     * @throws IOException
+     */
+    void flush() throws IOException;
+    
+}