HttpTextFormat propagator.ContextPropagators with the specified propagators.DefaultContextPropagators.Builder to create a new ContextPropagators
object.Context.DefaultContextPropagators is the default, built-in implementation of ContextPropagators.DefaultContextPropagators.Builder is used to construct a new ContextPropagators object with the specified
propagators.key or returns null.HttpTextFormat propagator.HttpTextFormat to read propagated fields from a carrier.HttpTextFormat to set propagated fields into a carrier.Closeable that represents a change to the current context over a scope of code.Context as Context.current(), returning a Scope to
end its active state and restore the previous active Context.