SpanContext not found in Extract carrier in microservice
问题 I am trying to implement a Go-based microservice system. I have two service and I try to Inject and Extract span data. In my first service, I have: func (apitracer apiTracer) validatemail(res http.ResponseWriter, req *http.Request) { validateEmailSpan := apitracer.tracer.StartSpan("Validate Email") apitracer.tracer.Inject( validateEmailSpan.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header)) req.Header.Set("Content-Type", "application/x-www-form-urlencoded") resp,