Fix IE bug with decoding json response without encoding.

[kak-tus]

IE 7,8,9 has bug with decoding of json response without encoding.
See http://stackoverflow.com/questions/8481453/jquery-ajax-request-doesnt-success-with-json-on-ie

The default encoding of application/json is UTF-8.
http://www.ietf.org/rfc/rfc4627.txt

That means, we can specify encoding in response without any trouble.

[Grinnz]

+1, this is one of the the first things I set in most projects anyway.

[jberger]

For what its worth, I'm happy that @kak-tus made the appropriate fixes for the tests and made a complete proposal. In isolation I would say sure, but I worry that this might need to be treated as a breaking change. My concern is for things like

$t->header_is('Content Type', 'application/json')

Which will suddenly start failing for people.

[kraih]

The list of MIME types in Mojolicious::Types has not been updated.

[kak-tus]

@jberger Another variant is to do something like this for json renderer

$self->res->headers->content_encoding('utf-8');

May be it more safely.

[kraih]

I'll give this a 👍, since all commonly used REST APIs i've tested appear to be using application/json;charset=UTF-8.

[jhthorsen]

👍 I don't have any good reasons for my thumb up, other than serving json as anything else than UTF-8 isn't something I do.