NewDefaultPreparedCache creates a new default prepared cache capping the max item capacity to `size`.

NewDefaultRetryPolicy creates a new default retry policy.

Run starts the proxy command.

RetryNext should be returned when a request should be retried on the next host according to the request's query plan.

RetrySame should be returned when a request should be retried on the same host.

ReturnError should be returned when a request's original error should be forwarded along to the client.

RetryPolicy is an interface for defining retry behavior when a server-side error occurs.

RetryDecision is a type used for deciding what to do when a request has failed.