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Well if you are really lucky, the following method will return the server name and version in a form something like:
Server: Microsoft-IIS/5.0
However, this is not as straight-forward as it may seem. First of all, if the site is running a caching Web proxy, you might be connecting to the Web proxy rather than the Web server, which can return invalid results. If the site is using a load balancer, you might also get invalid results. If the site is using a TCP firewall, you could get a response from the firewall machine rather than the Web server, again with invalid results.
void getServerInfo(String aURL)
{
BufferedReader reader;
URL url = new URL(aURL);
String host = url.getHost();
int port = url.getPort();
if (port == -1)
port = 80;
String file = url.getFile();
Socket socket = new Socket(host, port);
Writer writer = new
OutputStreamWriter(socket.getOutputStream());
Reader inReader = new
InputStreamReader(socket.getInputStream());
BufferedReader bufReader = new BufferedReader(inReader);
try {
writer.write("GET " + file + " HTTP/1.0\r\n\n");
writer.flush();
String input;
while ((input = bufReader.readLine()) != null)
{
System.out.println(input);
}
}
catch(Exception e)
{
System.out.println(e.toString());
}
finally
{
reader.close();
}
} This was first published in September 2002
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