HTTP Limit headers

[jeanpsv]

I would like to set the HTTP headers:

• X-Rate-Limit-Limit: The number of allowed requests in the current period
• X-Rate-Limit-Remaining: The number of remaining requests in the current period
• X-Rate-Limit-Reset: The number of seconds left in the current period

something like this:

var RateLimiter = require('limiter').RateLimiter;
var limiter = new RateLimiter(150, 'hour', true);
console.log(limiter.limit()); // 150
console.log(limiter.reset()); // 58 (seconds elapsed)

Can I do something like that?

[jhurliman]

You could do something similar, but those exact headers would be tricky with node-rate-limiter. The reason is because token buckets (which node-rate-limiter uses under the hood) do continuous rate limiting; there is no concept of a fixed period of time before the throttle resets. You could implement this yourself on top of the rate limiter by initializing

var limiter = new RateLimiter(150, 'hour', true);

as well as recording the time when the limiter started, and starting a one hour timer that would reinitialize the rate limiter (and start time and reset timer). Then Limit would be 150, Remaining would be limiter. getTokensRemaining(), and Reset would be one hour minus the number of seconds that have elapsed since the start time.

[jeanpsv]

Ok. Thank you for the response.