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/*
 * $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/methods/HeadMethod.java,v 1.19.2.4 2004/06/13 20:24:49 olegk Exp $
 * $Revision: 1.19.2.4 $
 * $Date: 2004/06/13 20:24:49 $
 *
 * ====================================================================
 *
 *  Copyright 1999-2004 The Apache Software Foundation
 *
 *  Licensed 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
 * .
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */

package org.apache.commons.httpclient.methods;

import java.io.IOException;

import org.apache.commons.httpclient.HttpConnection;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.HttpState;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Implements the HTTP HEAD method.
 * 

* The HTTP HEAD method is defined in section 9.4 of * RFC2616: *

* The HEAD method is identical to GET except that the server MUST NOT * return a message-body in the response. The metainformation contained * in the HTTP headers in response to a HEAD request SHOULD be identical * to the information sent in response to a GET request. This method can * be used for obtaining metainformation about the entity implied by the * request without transferring the entity-body itself. This method is * often used for testing hypertext links for validity, accessibility, * and recent modification. *
*

* * @author Remy Maucherat * @author Mike Bowler * @author Jeff Dever * @author oleg Kalnichevski * * @version $Revision: 1.19.2.4 $ * @since 1.0 */ public class HeadMethod extends HttpMethodBase { //~ Static variables/initializers ииииииииииииииииииииииииииииииииииииииииии /** Log object for this class. */ private static final Log LOG = LogFactory.getLog(HeadMethod.class); private int bodyCheckTimeout = -1; /* Disabled per default */ //~ Constructors иииииииииииииииииииииииииииииииииииииииииииииииииииииииииии /** * No-arg constructor. * * @since 1.0 */ public HeadMethod() { setFollowRedirects(true); } /** * Constructor specifying a URI. * * @param uri either an absolute or relative URI * * @since 1.0 */ public HeadMethod(String uri) { super(uri); setFollowRedirects(true); } //~ Methods ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии /** * Returns "HEAD". * * @return "HEAD" * * @since 2.0 */ public String getName() { return "HEAD"; } /** * Recycles the HTTP method so that it can be used again. * Note that all of the instance variables will be reset * once this method has been called. This method will also * release the connection being used by this HTTP method. * * @see #releaseConnection() * * @since 1.0 * * @deprecated no longer supported and will be removed in the future * version of HttpClient */ public void recycle() { super.recycle(); setFollowRedirects(true); } /** * Overrides {@link HttpMethodBase} method to not read a response * body, despite the presence of a Content-Length or * Transfer-Encoding header. * * @param state the {@link HttpState state} information associated with this method * @param conn the {@link HttpConnection connection} used to execute * this HTTP method * * @throws IOException if an I/O (transport) error occurs * @throws HttpException if a protocol exception occurs. * @throws HttpRecoverableException if a recoverable transport error occurs. * Usually this kind of exceptions can be recovered from by * retrying the HTTP method * * @see #readResponse * @see #processResponseBody * * @since 2.0 */ protected void readResponseBody(HttpState state, HttpConnection conn) throws IOException { LOG.trace( "enter HeadMethod.readResponseBody(HttpState, HttpConnection)"); if (this.bodyCheckTimeout < 0) { responseBodyConsumed(); } else { if (LOG.isDebugEnabled()) { LOG.debug("Check for non-compliant response body. Timeout in " + this.bodyCheckTimeout + " ms"); } boolean responseAvailable = false; try { responseAvailable = conn.isResponseAvailable(this.bodyCheckTimeout); } catch (IOException e) { LOG.debug("An IOException occurred while testing if a response was available," + " we will assume one is not.", e); responseAvailable = false; } if (responseAvailable) { if (isStrictMode()) { throw new HttpException( "Body content may not be sent in response to HTTP HEAD request"); } else { LOG.warn("Body content returned in response to HTTP HEAD"); } super.readResponseBody(state, conn); } } } /** * Return non-compliant response body check timeout. * * @return The period of time in milliseconds to wait for a response * body from a non-compliant server. -1 returned when * non-compliant response body check is disabled */ public int getBodyCheckTimeout() { return this.bodyCheckTimeout; } /** * Set non-compliant response body check timeout. * * @param timeout The period of time in milliseconds to wait for a response * body from a non-compliant server. -1 can be used to * disable non-compliant response body check */ public void setBodyCheckTimeout(int timeout) { this.bodyCheckTimeout = timeout; } }


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