Content-Disposition filename should be URL-encoded
Summary:
As specified in https://tools.ietf.org/html/rfc6266#section-5
Refs T183907
Reviewers: fgiunchedi
Reviewed By: fgiunchedi
Subscribers: BBlack, ema
Maniphest Tasks: T183907
Differential Revision: https://phabricator.wikimedia.org/D944