I still cannot figure out hook, the values passed to it(or jus, received (why not passed, or where passed from?)) and what executes it.
Well, CGI explains all that in
Progress bars for file uploads and avoiding_temp files
but what happens is, CGI has a socket for the upload, every time it reads a chunk from the socket, it calls the hook with the new data, which is where your parameters are coming from.
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