text: from py_zipkin.zipkin import ZipkinAttrs
  from py_zipkin.thrift import zipkin_core
  
  def request_to_zipkinattrs(request):
  	try:
  		return ZipkinAttrs(
  			trace_id=request.META['HTTP_X_B3_TRACEID'],
  			span_id=request.META['HTTP_X_B3_SPANID'],
  			parent_span_id=request.META['HTTP_X_B3_PARENTSPANID'],
  			flags=request.META['HTTP_X_B3_FLAGS'],
  			is_sampled=request.META['HTTP_X_B3_SAMPLED'] == '1',
  		)
  	except KeyError:
  		return None
  
  def request_to_binary_attrs(request):
  	return {
  		zipkin_core.CLIENT_ADDR: request.META['REMOTE_ADDR'],
  		zipkin_core.HTTP_HOST: request.get_host(),
  		zipkin_core.HTTP_METHOD: request.method,
  		zipkin_core.HTTP_PATH: request.path,
  		zipkin_core.HTTP_URL: request.build_absolute_uri(),
  		zipkin_core.HTTP_REQUEST_SIZE: request.META.get('CONTENT_LENGTH', '0'),
  	}
  