mod_http_oauth2: Don't return redirects or HTML from token endpoint These are used by the client, not the user, so makes more sense to return JSON directly instead of a redirect or HTML error page when .

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```