text: import json
  
  import bm
  
  from ddtrace.propagation import _utils as utils
  from ddtrace.propagation import http
  
  
  class HTTPPropagationExtract(bm.Scenario):
      headers = bm.var(type=str)
      extra_headers = bm.var(type=int)
      wsgi_style = bm.var(type=bool)
  
      def generate_headers(self):
          headers = json.loads(self.headers)
          if self.wsgi_style:
              headers = {utils.get_wsgi_header(header): value for header, value in headers.items()}
  
          for i in range(self.extra_headers):
              header = "x-test-header-{}".format(i)
              if self.wsgi_style:
                  header = utils.get_wsgi_header(header)
              headers[header] = str(i)
  
          return headers
  
      def run(self):
          headers = self.generate_headers()
  
          def _(loops):
              for _ in range(loops):
                  http.HTTPPropagator.extract(headers)
  
          yield _
  