class LHC::Zipkin

def before_request(request) 

def before_request(request)
  return unless defined?(ZipkinTracer::TraceContainer)
  container = ZipkinTracer::TraceContainer.current
  request.headers['X-B3-TraceId'] = container.trace_id.to_s
  request.headers['X-B3-ParentSpanId'] = container.parent_id.to_s if container.parent_id
  request.headers['X-B3-Sampled'] = container.sampled
  request.headers['X-B3-Flags'] = container.flags
end