org.apache.commons.httpclient.methods.HeadMethod Maven / Gradle / Ivy
/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/methods/HeadMethod.java,v 1.29 2004/06/13 20:22:19 olegk Exp $
* $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
*
* 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: 480424 $
* @since 1.0
*/
public class HeadMethod extends HttpMethodBase {
//~ Static variables/initializers
/** Log object for this class. */
private static final Log LOG = LogFactory.getLog(HeadMethod.class);
//~ Constructors
/**
* 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
/**
* 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. Some transport exceptions
* can be recovered from.
* @throws HttpException if a protocol exception occurs. Usually protocol exceptions
* cannot be recovered from.
*
* @see #readResponse
* @see #processResponseBody
*
* @since 2.0
*/
protected void readResponseBody(HttpState state, HttpConnection conn)
throws HttpException, IOException {
LOG.trace(
"enter HeadMethod.readResponseBody(HttpState, HttpConnection)");
int bodyCheckTimeout =
getParams().getIntParameter(HttpMethodParams.HEAD_BODY_CHECK_TIMEOUT, -1);
if (bodyCheckTimeout < 0) {
responseBodyConsumed();
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("Check for non-compliant response body. Timeout in "
+ bodyCheckTimeout + " ms");
}
boolean responseAvailable = false;
try {
responseAvailable = conn.isResponseAvailable(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 (getParams().isParameterTrue(HttpMethodParams.REJECT_HEAD_BODY)) {
throw new ProtocolException(
"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);
}
}
}
/**
* Returns 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
*
* @deprecated Use {@link HttpMethodParams}
*
* @see #getParams()
* @see HttpMethodParams
* @see HttpMethodParams#HEAD_BODY_CHECK_TIMEOUT
*/
public int getBodyCheckTimeout() {
return getParams().getIntParameter(HttpMethodParams.HEAD_BODY_CHECK_TIMEOUT, -1);
}
/**
* Sets 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
*
* @deprecated Use {@link HttpMethodParams}
*
* @see #getParams()
* @see HttpMethodParams
* @see HttpMethodParams#HEAD_BODY_CHECK_TIMEOUT
*/
public void setBodyCheckTimeout(int timeout) {
getParams().setIntParameter(HttpMethodParams.HEAD_BODY_CHECK_TIMEOUT, timeout);
}
}
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