Ajax long connect using server heart beat to check client connect if it is closed

Using a trick HTTP response header

HTTP/1.1 200 OK
Server: xxx
Beat: Waiting.................................... // trick
Connection:Close
Content-length:255
Content-type:text/xml
Date:Wed Apr 20 12:01:17 EST 2011
Expires:Sun, 24 Apr 1981 01:29:32 GMT

Java binary data process class DataInputStream

The good sample for binary data processing

Search a byte array for a byte sequence

The Knuth-Morris-Pratt Pattern Matching Algorithm can be used to search a byte array.
http://helpdesk.objects.com.au/java/search-a-byte-array-for-a-byte-sequence