import java.net.*;
import java.io.*;

// By: L.Goulet     webmaster@java.dyn.ml.org
//
// This shows how to avoid browser caching when you fetch documents
//
// compile it and use:  
//        
//     java No_browser_cache www.yahoo.com index.html
// 
// or
//     java No_browser_cache your_host your_file
// 
// To see yahoo's main page or whatever appear at System.out
//
// Don't take the chance to have your files cached by some browser
// and have your product fail if update is critical for you!
//
// Socket connections migth not be allowed to go through firewall
// where URL are fetched through a proxy on some weird port,
// so back up with URLConnection just in case...
//
// Browser don't even know about your Socket connexion, so
// there is no way it can cache the file...


public class No_browser_cache

{ public static void main(String argv[])
  { Socket s = null; 
  
try {
    StringBuffer document = new StringBuffer(); 
    s = new Socket(argv[0],80);
    DataInputStream server_in = new DataInputStream(s.getInputStream());
   
   // DataInputStream.readLine() is deprecated, use:
   // BufferedReader server_in  = 
   //       new BufferedReader(new InputStreamReader(s.getInputStream()));
   // if you want but it only works in jdk1.1
   
    PrintStream server_out = new PrintStream(s.getOutputStream());
    server_out.println("GET /"+argv[1]+" HTTP/1.0"+"\n");
    int i=0;
    String line;
    for (i=0; i<100; i++)
    {  if ( server_in.available() != 0 )          
         { i = 0;
           line = server_in.readLine();
           document.append(line+"\n");                     // </HTML>
           if (line.toUpperCase().indexOf("</HTML>")!= -1) // or what ever
             break;                                        // your file 
         }                                                 // terminator is
       else  
         Thread.sleep(500); // that makes a 50 seconds time out 
                            // (100*500ms) check for data every half second
    }      
    System.out.println(document.toString());
    
   }      

 catch(Exception e)
   { // put your regular URLConnexion code in here...
     System.out.println();
     System.out.println
     ("Did not work, should put conventionnal URLConnection code here,");
     System.out.println
     ("or find out how to talk to the proxy... ;-)");
     System.out.println();
     System.out.println
     ("Not using a proxy???");
     System.out.println();
     System.out.println
     ("*** Of course you have to type the parameters right at the command");
     System.out.println
   ("line or you will see this message also, all exeptions are catched here.");   
     System.out.println();
     System.out.println
     ("Usage: java No_browser_cache <hostname> <filename>");
     System.out.println();
   }
   
 finally
   {  try               // make sure socket is closed whatever happends 
       { if (s != null) 
          { s.close() ;
            System.out.println("Socket closed, everything went fine"); 
          }   
       }
      catch (Exception  e) 
       {  
       }
   }    
   
}  // end main        

} // end class