define types of fields on the class-level

fastapi/security/api_key.py

@@ -9,6 +9,8 @@ from starlette.status import HTTP_401_UNAUTHORIZED
 
 
 class APIKeyBase(SecurityBase):
+    model: APIKey
+
     def __init__(
         self,
         location: APIKeyIn,

fastapi/security/http.py

@@ -67,6 +67,8 @@ class HTTPAuthorizationCredentials(BaseModel):
 
 
 class HTTPBase(SecurityBase):
+    model: HTTPBaseModel
+
     def __init__(
         self,
         *,
@@ -75,9 +77,7 @@ class HTTPBase(SecurityBase):
         description: str | None = None,
         auto_error: bool = True,
     ):
-        self.model: HTTPBaseModel = HTTPBaseModel(
-            scheme=scheme, description=description
-        )
+        self.model = HTTPBaseModel(scheme=scheme, description=description)
         self.scheme_name = scheme_name or self.__class__.__name__
         self.auto_error = auto_error