NewConstantBackoff returns an instance of ConstantBackoff.

NewExponentialBackoff returns an instance of ExponentialBackoff.

NewNoRetrier returns a null object for retriable.

NewRetrier returns retrier with some backoff strategy.

NewRetrierFunc returns a retrier with a retry function defined.

Backoff interface defines contract for backoff strategies.

Client Is a generic HTTP client interface.

Doer interface has the method required to use a type as custom http client.

Plugin defines the interface that a Heimdall plugin must have plugins can be added to a Heimdall client using the `AddPlugin` method.

Retriable defines contract for retriers to implement.

RetriableFunc is an adapter to allow the use of ordinary functions as a Retriable.