Efficient serving of large files using iterator?

Hi,

I've tried

from ZPublisher.Iterators import filestream_iterator
return filestream_iterator('/home/chrism/bigfile.xls', 'r')

in a method to return a big file to users;  however, it doesn't work, are
there alternative ways to serve large files to users, serving files that
are lying somewhere on the filesystem?

Thanks,

Morten

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