Informational: ratelimit internet draft

[ioggstream]

Informational

I'm working to a draft for standardizing ratelimit headers:

• https://ioggstream.github.io/draft-polli-ratelimit-headers/draft-polli-ratelimit-headers.html

which are essentially compatible with the Retry-After delta-seconds format.
The delta-seconds format is resilient to ntp skew.

RateLimit-Limit: containing the requests quota in the time window;
RateLimit-Remaining: containing the remaining requests quota in the current window;
RateLimit-Reset: containing the time remaining in the current window, specified in seconds or as a timestamp;

Until that's not a standard, the X- prefix can be used.

rate-limit headers simplifies rate-limiting documentation.