tracemethod.java

Light in the box 抓取程序。 使用HttpClient

/*
 * $Header: $
 * $Revision: 480424 $
 * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
 *
 * ====================================================================
 *
 *  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.commons.httpclient.methods;

import org.apache.commons.httpclient.HttpMethodBase;

/**
 * Implements the HTTP TRACE method.
 * <p>
 * The HTTP TRACE method is defined in section 9.6 of 
 * <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616</a>:
 * <blockquote>
 *  The TRACE method is used to invoke a remote, application-layer loop-
 *  back of the request message. The final recipient of the request
 *  SHOULD reflect the message received back to the client as the
 *  entity-body of a 200 (OK) response. The final recipient is either the
 *  origin server or the first proxy or gateway to receive a Max-Forwards
 *  value of zero (0) in the request (see section 14.31). A TRACE request
 *  MUST NOT include an entity.
 * </blockquote>
 * </p>
 *
 * @author Sean C. Sullivan
 * @author <a href="mailto:[e-mail]">Mike Bowler</a>
 * @author <a href="mailto:[e-mail]">Jeff Dever</a>
 *
 * @version $Revision: 480424 $
 * @since 2.0
 * 
 */
public class TraceMethod extends HttpMethodBase {

    //~ Constructors

    /**
     * Constructor specifying a URI.
     *
     * @param uri either an absolute or relative URI
     * 
     * @since 2.0
     * 
     */
    public TraceMethod(String uri) {
        super(uri);
        setFollowRedirects(false);
    }

    //~ Methods

    /**
     * Returns <tt>"TRACE"</tt>.
     * 
     * @return <tt>"TRACE"</tt>
     * 
     * @since 2.0
     * 
     */
    public String getName() {
        return "TRACE";
    }

    /**
     * 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 2.0
     * 
     * @deprecated no longer supported and will be removed in the future
     *             version of HttpClient
     */
    public void recycle() {
        super.recycle();
        setFollowRedirects(false);
    }

}