Controller produces: defaults to render JSON in a browser (text/html) view

Using the browser to directly access (GET) endpoints is usally (at
least for me) a very convenient way to quickly check things.
With the controller, when the RESTFul endpoint is configured to
produce "JSON", a URL like this (in the browser)

http://localhost:8080/scaffoldtester/customers

returns 404

However, with curl (curl -v -H "Accept: application/json" -H
"Content-type: application/json" -X GET
http://localhost:8080/scaffoldtester/customers/)
It works since we explicitly specifiy the application/json

I wonder.... if there could be a nicer way, to allow JSON, and the
TEXT/HTML - without adding more produces() ?