func Binary(sc trace.SpanContext) []byte
Binary returns the binary format representation of a SpanContext.
If sc is the zero value, Binary returns nil.
func FromBinary(b []byte) (sc trace.SpanContext, ok bool)
FromBinary returns the SpanContext represented by b.
If b has an unsupported version ID or contains no TraceID, FromBinary returns with ok==false.
HTTPFormat implementations propagate span contexts in HTTP requests.
SpanContextFromRequest extracts a span context from incoming requests.
SpanContextToRequest modifies the given request to include the given span context.
type HTTPFormat interface {
SpanContextFromRequest(req *http.Request) (sc trace.SpanContext, ok bool)
SpanContextToRequest(sc trace.SpanContext, req *http.Request)
}