xml-pdf servlet output timeout

[bonsigno]

Hi,
I had writen a servlet who generates a dynamic PDF document with a long
elaboration time (some minutes).
In the mean time the client browser that had made the servlet request,
shows the errors "HTTP 500 - Internal server error" or "Unable to find
the server or DNS error".
The servlet elaboration continue without exception and produces the
document ... but the result never arrives to the client.
Someone knows more about this problem?
Thanks
Roberto Bonsignori