There are four headers required in URL:

• EXPIRES: Mon, 01 Jan 1999 12:00:00 GMT: this is used to inform the WAP device about the expiry of the deck and it sets the date that was given in the past. 

The CODE that is being written also gets EXPIRED and removed as soon as the application gets shut down. 

• Last-Modified: 01 July 2000 12:00:00 GMT: this is used to inform about the date of the deck that was modified before. 

 It can be used to replace with the valid date and the time values that is being defined using the PROGRAMMING environment. 

• Cache-Control: no-cache, must-revalidate: this provides an HTTP header used for the caching of the page and it is used to store the version of the HTTP header of the server. 

• Pragma: no-cache

There are four headers required in URL:

The code that is being written also gets expired and removed as soon as the application gets shut down. 

 It can be used to replace with the valid date and the time values that is being defined using the programming environment.