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For mod_include subrequests, the default_handler() adds a
Last-Modified field to the request_rec.  This is an expensive
operation (due to the date/time formatting required), so I'd
like to eliminate it.

Is it safe to suppress the setting of Last-Modified in
default_handler() when r->main!=NULL?  If there are any
cases where we *would* need to set Last-Modified on a
subrequest, is there a heuristic that could be used to
distinguish them from the mod_include case?

Thanks,
--Brian