Imports k8s.io/apimachinery/pkg/util/sets knative.dev/pkg/logging go.uber.org/zap go.opencensus.io/trace go.opencensus.io/plugin/ochttp go.uber.org/zap/zapcore go.opencensus.io/plugin/ochttp/propagation/b3 knative.dev/pkg/tracing knative.dev/eventing/pkg/utils Standard library imports bytes errors fmt io/ioutil net/http net/url regexp strings