Package throttled implements rate limiting access to resources such as HTTP endpoints.
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Latest commit def5708 Nov 19, 2018

Throttled build status GoDoc

Package throttled implements rate limiting using the generic cell rate algorithm to limit access to resources such as HTTP endpoints.

The 2.0.0 release made some major changes to the throttled API. If this change broke your code in problematic ways or you wish a feature of the old API had been retained, please open an issue. We don't guarantee any particular changes but would like to hear more about what our users need. Thanks!


go get -u


API documentation is available on The following example demonstrates the usage of HTTPLimiter for rate-limiting access to an http.Handler to 20 requests per path per minute with bursts of up to 5 additional requests:

store, err := memstore.New(65536)
if err != nil {

quota := throttled.RateQuota{throttled.PerMin(20), 5}
rateLimiter, err := throttled.NewGCRARateLimiter(store, quota)
if err != nil {

httpRateLimiter := throttled.HTTPRateLimiter{
	RateLimiter: rateLimiter,
	VaryBy:      &throttled.VaryBy{Path: true},

http.ListenAndServe(":8080", httpRateLimiter.RateLimit(myHandler))

Related Projects

See throttled/gcra for a list of other projects related to rate limiting and GCRA.


  1. Update Please use semantic versioning and the existing conventions established in the file. Commit the changes with a message like Bump version to 2.2.0.
  2. Tag master with a new version prefixed with v. For example, v2.2.0.
  3. git push origin master --tags.
  4. Publish a new release on the releases page. Copy the body from the contents of for the version and follow other conventions from previous releases.


The BSD 3-clause license. Copyright (c) 2014 Martin Angers and contributors.