recipe: rate limiting

[dryaf]

it would be great if there was a recipe for using rate limiting.
just read http://www.vinaysahni.com/best-practices-for-a-pragmatic-restful-api

would be great if echo included this functionality
with returning headers like
X-Rate-Limit-Limit
X-Rate-Limit-Remaining
X-Rate-Limit-Reset

[dryaf]

This might do the trick
https://github.com/valyala/fasthttp
and would give echo another boost
"Currently fasthttp is successfully used in a production serving up to 1M concurrent keep-alive connections doing 50K qps from a single server.
"... up to 10 times faster than net/http ..."

• Server provides the following anti-DoS limits:
  • The number of concurrent connections.
  • The number of concurrent connections per client IP.
  • The number of requests per connection.
  • Request read timeout.
  • Response write timeout.
  • Maximum request header size.
  • Maximum request execution time.
  • Maximum keep-alive connection lifetime."

[vishr]

Closing to mention in #269.