| Long: proto |
| Arg: <protocols> |
| Help: Enable/disable PROTOCOLS |
| See-also: proto-redir proto-default |
| Added: 7.20.2 |
| --- |
| Tells curl to limit what protocols it may use in the transfer. 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 |
| |
| 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. |
