Streaming files

In Java servlets, I can stream a file back to the browser one chunk at a
time. This has 2 benefits which interest me.
1) Files can be stored outside the web root so users cannot download them
unless they are logged in, even if they know the path.
2) Large files can be streamed back to the client without having the entire
file loaded into memory at the same time

How would you recommend achieving similar functionality in mod_perl?

-- 
John Dunlap
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