code: def get_operation_pattern(server_url, request_url_pattern):
      
      if server_url[-1] == "/":
          # operations have to start with a slash, so do not remove it
          server_url = server_url[:-1]
      if is_absolute(server_url):
          return request_url_pattern.replace(server_url, "", 1)
      return path_qs(request_url_pattern).replace(server_url, "", 1)
docs: Return an updated request URL pattern with the server URL removed.