Thanks to much help from @balbinus, I solved my "503 Remote SSL cert could not be verified" error when looking up my custom #ActivityPub server from #Mastodon: content negotiation on my server was failing on the "webfinger" URL, presumably because of the request's "Accept:" headers confusing Apache which didn't think to route it to "webfinger.php". Nothing whatsoever to do with SSL certificates 🙄
Now that WebFinger is working, I'm… stuck again with the same error message, but on the next file 🤦
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