Forbid wildcard in content_type_provided

[benjamin-bergia]

I wrote a small rest handler using cowboy 2.9.0 for testing purpose and I ended up with this code in it:

content_types_provided(Req, State) ->
  {[
    {{'*', '*', '*'}, to_plain_text}
  ], Req, State}.

I didn't get any error or warning when running this code. But all the requests hang and timeout.
When checking the console I see the following:

=ERROR REPORT==== 30-Jan-2023::14:40:54.876256 ===
Bad value on output port 'tcp_inet'

I don't think {'*', '*', '*'} this is valid and it shouldn't work but it would be nice if this could fail earlier somehow and/or with a better error.