org.rhq.plugins.www.util.WWWUtils Maven / Gradle / Ivy
/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.rhq.plugins.www.util;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
/**
* Helper class that contains methods that send http requests and evaluate results
* @author Ian Springer
*/
public abstract class WWWUtils {
/**
* Sends a HEAD request to the passed url and returns if the server was reachable
* @param httpURL a http or https URL to check
* @return true if connecting to the URL succeeds, or false otherwise
*/
public static boolean isAvailable(URL httpURL) {
try {
HttpURLConnection connection = (HttpURLConnection) httpURL.openConnection();
connection.setRequestMethod("HEAD");
connection.setConnectTimeout(3000);
connection.connect();
// get the respone code to actually trigger sending the Request.
connection.getResponseCode();
} catch (IOException e) {
return false;
}
return true;
}
/**
* Get the content of the 'Server:' header
* @param httpURL a http or https URL to get the header from
* @return The contents of the header or null if anything went wrong or the field was not present.
*/
public static String getServerHeader(URL httpURL) {
String ret;
try {
HttpURLConnection connection = (HttpURLConnection) httpURL.openConnection();
connection.setRequestMethod("HEAD");
connection.setConnectTimeout(3000);
connection.connect();
// get the respone code to actually trigger sending the Request.
connection.getResponseCode();
ret = connection.getHeaderField("Server");
}
catch (IOException e) {
ret = null;
}
return ret;
}
}