X-RateLimit headers

[gvc]

I'm building an API with throttling and the API has well educated clients, that can respect the X-RateLimit headers. I haven't found a way to do this in the rack-attack gem. Is there an interest in this feature for throttling? I can develop, but was just wondering if it's desirable to the gem.

Many APIs are using this already:
http://developer.github.com/v3/#rate-limiting
http://developer.vimeo.com/guidelines/rate-limiting
https://dev.twitter.com/docs/rate-limiting/1.1

Looking forward for your feedback.

[ktheory]

Good question, @gvc. It's pretty easy to figure out what to put in the X-RateLimit response header by inspecting the annotated environment.

Check out a request's env['rack.attack.throttle_data']. It's a hash of throttles the request matched (but didn't necessarily exceed); and the count, period, and limit of the throttle. It's set here.

[dapicester]

@gvc have a look at this: https://github.com/jbyck/rack-attack-rate-limit