Forcing Offline Mode

I would like to simulate a offline mode when my server is up. In this case on my server something is down, but my web server is up.
If I send an HTTP error message (503, 404, 500) in response of a get http method sent by JWS, JWS displays an error message instead of running in offline mode (launching the jnlp file in the cache).
How could I answer to JWS to simulate a down server in order to work in the offline mode ?

>
To be honest, I don't know if we talk about the same
thing, when we mean "offline mode".
OK, I explain my problem. It s certainly not really clear.
First launching of my application :
The user asks for the JNLP file on the web server by using his favorite browser.
The JNLP file is dynamic, in fact it s a servlet. The servlet returns the JNLP to the browser.
The browser gives the JNLP to JWS.
JWS checks the JNLP file and downloads the ressources (jar files)
JWS launch the java application
Another launch :
The user clicks the Application Icon.
JWS checks if there is a new release of the JNLP file on the web server.
The servlet returns that there is no update of the JNLP file.
JWS loads the JNLP file of its cache and runs the application.
The web server is down :
The user clicks the Application Icon.
JWS checks if there is a new release of the JNLP file on the web server.
The web server is down, so there is a timeout.
So, JWS loads the JNLP file of its cache and runs the application.
The problematic case :(The web server is not down, but I want to simulate this case)
The user clicks the Application Icon.
JWS checks if there is a new release of the JNLP file on the web server.
The servlet has to access a database but this db is down, so the servlet has to return an error code to notify JWS to run the JNLP file in offline mode (in the cache). So the servlet returns an http error.
JWS stops and displays an error message :(((
My problem is this last case, I would like JWS runs in offline mode in this case : reading JNLP file from the cache and launching the application in the cache.
Somebody knows what sort of error my servlet has to return ?
Thanks !!
And Happy Xmas !!

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Note: "''YOUR USERNAME''" relates to the account you log on to Windows with.
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