Imports github.com/uber/kraken/utils/httputil github.com/uber/kraken/utils/errutil github.com/cenkalti/backoff github.com/uber/kraken/core github.com/uber/kraken/lib/hostlist github.com/uber/kraken/utils/log github.com/uber/kraken/utils/memsize Standard library imports bytes crypto/tls encoding/json errors fmt io io/ioutil math math/rand net/http net/url strconv strings sync time