code: def execute(func, handler, args, kwargs):
      
      tracing = handler.settings.get('opentracing_tracing')
  
      with tracer_stack_context():
          if tracing._trace_all:
              attrs = handler.settings.get('opentracing_traced_attributes', [])
              tracing._apply_tracing(handler, attrs)
  
          return func(*args, **kwargs)
docs: Wrap the handler ``_execute`` method to trace incoming requests,
      extracting the context from the headers, if available.