curl-w32/docs/cmdline-opts/proto-redir.md

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Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl proto-redir <protocols> Enable/disable PROTOCOLS on redirect 7.20.2 connection curl single
proto
--proto-redir =http,https $URL

--proto-redir

Tells curl to limit what protocols it may use on redirect. Protocols denied by --proto are not overridden by this option. See --proto for how protocols are represented.

Example, allow only HTTP and HTTPS on redirect:

curl --proto-redir -all,http,https http://example.com

By default curl only allows HTTP, HTTPS, FTP and FTPS on redirects (added in 7.65.2). Specifying all or +all enables all protocols on redirects, which is not good for security.