On Sun, 22 Oct 2023, Stephen Farrell via curl-library wrote:
So, finally getting to the question, for a ZF to use curl to check if a
requested ALPN works or not, (in conjunction with the relevant
ECHConfigList), there'd have to be a new way to pass in ALPN values from the
command line. As of now, IIUC there's no way to do that, but should there
be?
If the answer's "yes," then we can play about with doing that as part of our
ECH PR. [2] That could later be separated out into a different PR I guess if
that's better.
If the answer's "no," I'd love to understand why it's a bad plan for curl to
accept a command line argument for setting ALPN values.
Are there actually cases where sending in a custom ALPN is likely to be the
right thing for a user to get a transfer going? I have not heard of any such
cases before.
If not, then setting a custom ALPN is likely to just cause the transfer to
fail since curl does not just negotaite an ALPN and then says "yes it worked",
right?
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