1  """
 2  Extension module
 3  """
 4  
 5  
 6  class Extension:
 7      """
 8      Defines an API extension. API extensions can expose custom pipelines or other custom logic.
 9      """
10  
11      def __call__(self, app):
12          """
13          Hook to register custom routing logic and/or modify the FastAPI instance.
14  
15          Args:
16              app: FastAPI application instance
17          """
18  
19          return