Rack::AcceptDefault is a tiny piece of middleware that sets default Accept: header when it isn't present, to work around Rails 3.x issues.
gem install rack-accept-default
require 'rack-accept-default`
use Rack::AcceptDefault
Rails default MIME negotiation (in ActionPack) handles requests without Accept: headers as invalid, and assume it wants the HTML view. This assumption is wrong per RFC 2616 HTTP/1.1 specification.
If no Accept header field is present, then it is assumed that the client accepts all media types
Rack::AcceptDefault is a piece of Rack middleware that provides a convenient way to work around this problem, by setting the */* value to the Accept header when it is not present.
MIT License.
Copyright 2012- Tatsuhiko Miyagawa