[Rails] Sinatra send my https redirects to http

I have a reverse proxy with nginx + thin, and it works great.

My problem is redirection to any controller when I'm under "https". It
will redirect to "http".

For example i'm on https://example.com
then I use

redirect "/view"

and I'm redirected to http://example.com/view

I've been searching but can't find anything.

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