GitHub user clearswift opened an issue:
https://github.com/apache/trafficserver/issues/1613
FTP Support
At the moment TS blocks requests for FTP URLs with an 'Unsupported
Protocol' error message. This precludes TS from simply forwarding requests for
FTP URLs to an upstream (parent) proxy.
We propose a fix to allow TS to forward FTP URLs to an upstream (parent)
proxy; where this proxy supports HTTP/FTP conversion (e.g. Squid) this would
enable FTP resources to be retrieved via TS. This change would also allow
protocol plugins to be developed that support FTP URLs.
FTP Support would be optionally enabled with a new configuration setting in
records.config preserving existing functionality if not present or set to the
default value of false.
e.g.
proxy.config.ftp_enabled=1
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