OAS Create File for Download with PL/SQL Pkg

On OAS 4.0.8.1, I am trying to create a PL/SQL DB Pkg to allow a WWW user to extract data from the DB and download it to their local workstation, for example, a class list of student names and ids in "tab-separated-values" format.
I think I have configured OAS and my browser to understand what to do with a MIME type of "TSV"s. I have issued the ora_util.mime_header to change the content type to "text/tab-separated-values", but all it does is send the header and the data to a WWW page. It appears that either the browser or the server does not recognize what to do with it, to prompt the browser to save the data (which is what I would like to have happen).
I am at my wit's end trying to figure out why it is not working. I have looked at all of the documentation I can lay my hands on, with no luck. Any suggestions, experiences, incantations?
Is what I am trying to do even reasonable? Is there a better way?
Phil
====
Phillip Brown
Administrative Computing
Information Services
Oregon State University

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