Per default, Plack::Middleware::Static will serve your files depending on their extension by using Plack::MIME. So I suggest that you just drop your own invocation of Plack::MIME for the "normal" behaviour and override it for your download directory like this: content_type => sub { 'text/plain' }

Edited to add: After a glance at the code, you can also provide the content type directly:

content_type => 'text/plain'

In reply to Re^3: How to use Plack::Middleware::Static by haj
in thread How to use Plack::Middleware::Static by vhein79

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