PLSQL: Preventing Cache? (HTTP headers?)

Old age problem: Preventing caching in PLSQL generated pages.

I need to add these three headers to my PLSQL generated pages, so to stop the pages being access through the cache.

CacheControl = "no-cache"
Pragma = "no-cache"
Expires = -1

The only problem is I cannot find a procedure/funtion in the htp package which can add custom HTTP headers (like the ones above - "meta" and "header" in the package does not relate to the HTTP Header.).

Simply adding these headers to the html inside the "META HTTP-EQUIV" tags does not solve the problem, as meta tags are not evaluated until after downloaded files have already been stored in the cache (MS KB199805). The headers need to be placed within the HTTP Headers.

My preferred solution would be to find a method to add custom http headers via PLSQL (how is everyone else controling cache?). However, is this only possible by altering settings on the webserver? (we have OASv4).

Any help/suggestions accepted :)

Many thanks,

Robert.

Tech Details:
- OASv4 on Unix

• DBv8.0.4.0