Description

Would be cool to force explicit FTPS without specifying --ssl-reqd when providing the URL ftpes://.

Example

curl ftpes://my-tls-ftp-server.example.com internally translates to curl --ssl-reqd ftp://my-tls-ftp-server.example.com

Why

• Makes it easier to use (FTP over TLS should be easier to use)
• This feature is supported in other clients too (e.g. FileZilla client)

Other things to consider

• Should we default to AUTH TLS instead of trying AUTH SSL beforehand?

  > AUTH SSL
  < 500 This security scheme is not implemented
  > AUTH TLS
  < 234 AUTH TLS OK.
  

• Should ftp:// in general try to upgrade to a TLS secured connection?

  > USER anonymous
  < 421 Sorry, cleartext sessions are not accepted on this server.
  * We got a 421 - timeout
  * closing connection #0