caching with authorization header

Hi all,

I am trying to understand the apache documentation regarding cacheable content.

From the documenation ( http://httpd.apache.org/docs/2.2/caching.html ):

--------------------- Begin Apache 2.2 DOCUMENTATION -----------------------
What Can be Cached?

mod_cache caching on the other hand is more complex. When serving a
request, if it has not been cached previously, the caching module will
determine if the content is cacheable. The conditions for determining
cachability of a response are;

4. If the request contains an "Authorization:" header, the response
will not be cached.
5. If the response contains an "Authorization:" header, it must
also contain an "s-maxage", "must-revalidate" or "public" option in
the "Cache-Control:" header.
--------------------- End Apache 2.2 DOCUMENTATION -----------------------

Two questions regarding above

1) Is there actually a flag and/or a trick i can use so that a
"response" from a request with a authorization header can actually be
cached ?
2) When and why would ever a response actually contain a
"authorization" header ?


Thank you

-seymen

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