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- Long: proto
- Arg: <protocols>
- Help: Enable/disable PROTOCOLS
- See-also: proto-redir proto-default
- Added: 7.20.2
- Category: connection curl
- Example: --proto =http,https,sftp $URL
- ---
- Tells curl to limit what protocols it may use for transfers. Protocols are
- evaluated left to right, are comma separated, and are each a protocol name or
- \&'all', optionally prefixed by zero or more modifiers. Available modifiers are:
- .RS
- .TP 3
- .B +
- Permit this protocol in addition to protocols already permitted (this is
- the default if no modifier is used).
- .TP
- .B -
- Deny this protocol, removing it from the list of protocols already permitted.
- .TP
- .B =
- Permit only this protocol (ignoring the list already permitted), though
- subject to later modification by subsequent entries in the comma separated
- list.
- .RE
- .IP
- For example:
- .RS
- .TP 15
- .B --proto -ftps
- uses the default protocols, but disables ftps
- .TP
- .B --proto -all,https,+http
- only enables http and https
- .TP
- .B --proto =http,https
- also only enables http and https
- .RE
- .IP
- Unknown protocols produce a warning. This allows scripts to safely rely on
- being able to disable potentially dangerous protocols, without relying upon
- support for that protocol being built into curl to avoid an error.
- This option can be used multiple times, in which case the effect is the same
- as concatenating the protocols into one instance of the option.
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