Split the App and Blueprint into Sansio and IO parts (#5127)

Author: davidism

CHANGES.rst

@@ -4,6 +4,8 @@ Version 3.0.0
 Unreleased
 
 -   Remove previously deprecated code. :pr:`5223`
+-   Restructure the code such that the Flask (app) and Blueprint
+    classes have Sans-IO bases. :pr:`5127`
 
 
 Version 2.3.3

src/flask/__init__.py

@@ -1,7 +1,5 @@
 from . import json as json
 from .app import Flask as Flask
-from .app import Request as Request
-from .app import Response as Response
 from .blueprints import Blueprint as Blueprint
 from .config import Config as Config
 from .ctx import after_this_request as after_this_request
@@ -37,5 +35,7 @@
 from .templating import render_template_string as render_template_string
 from .templating import stream_template as stream_template
 from .templating import stream_template_string as stream_template_string
+from .wrappers import Request as Request
+from .wrappers import Response as Response
 
 __version__ = "3.0.0.dev"