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@tchambers how would js handle it? either the links are rewritten (in which case they become useless when copied), or they’re not rewritten (in which case why do you need a protocol handler?)

i have to ask this because i’m not sure: have you tried the current interaction modal in fairly recent mastodon versions? it does something similar to what you describe, but it doesn’t require custom schemes at all. i think it uses webfinger and it has some bugs, but it generally works as you might expect.