With the latest code I'm getting an error response for these requests

\x80\x01\x00\x02\x27\x10\x80\x04\x00\x02\x00\x0f\x80\x00\x00\x00
\x80\x01\x00\x02\x00\x00\x80\x04\x00\x02\x27\x10\x80\x00\x00\x00

but they should have a non-error response, just having an empty record indicating the server doesn't support the requested next protocol or AEAD.

Originally posted by @mlichvar in #1557 (comment)