From f92996362b0401adb7156e2b84b11a8008521ac6 Mon Sep 17 00:00:00 2001
From: Marcelo Trylesinski <marcelotryle@gmail.com>
Date: Tue, 21 Jun 2022 20:33:29 +0200
Subject: [PATCH] Add missing string annotations

---
 uvicorn/middleware/proxy_headers.py | 2 +-
 uvicorn/middleware/wsgi.py          | 5 ++++-
 uvicorn/protocols/http/h11_impl.py  | 2 +-
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/uvicorn/middleware/proxy_headers.py b/uvicorn/middleware/proxy_headers.py
index ff090cf2ff..4b62cf209e 100644
--- a/uvicorn/middleware/proxy_headers.py
+++ b/uvicorn/middleware/proxy_headers.py
@@ -50,7 +50,7 @@ async def __call__(
         self, scope: "Scope", receive: "ASGIReceiveCallable", send: "ASGISendCallable"
     ) -> None:
         if scope["type"] in ("http", "websocket"):
-            scope = cast(Union[HTTPScope, WebSocketScope], scope)
+            scope = cast(Union["HTTPScope", "WebSocketScope"], scope)
             client_addr: Optional[Tuple[str, int]] = scope.get("client")
             client_host = client_addr[0] if client_addr else None
 
diff --git a/uvicorn/middleware/wsgi.py b/uvicorn/middleware/wsgi.py
index e9f7fa1884..9a79a3baf6 100644
--- a/uvicorn/middleware/wsgi.py
+++ b/uvicorn/middleware/wsgi.py
@@ -79,7 +79,10 @@ def __init__(self, app: WSGIApp, workers: int = 10):
         self.executor = concurrent.futures.ThreadPoolExecutor(max_workers=workers)
 
     async def __call__(
-        self, scope: HTTPScope, receive: ASGIReceiveCallable, send: ASGISendCallable
+        self,
+        scope: "HTTPScope",
+        receive: "ASGIReceiveCallable",
+        send: "ASGISendCallable",
     ) -> None:
         assert scope["type"] == "http"
         instance = WSGIResponder(self.app, self.executor, scope)
diff --git a/uvicorn/protocols/http/h11_impl.py b/uvicorn/protocols/http/h11_impl.py
index b7550dde82..a9632c6ea1 100644
--- a/uvicorn/protocols/http/h11_impl.py
+++ b/uvicorn/protocols/http/h11_impl.py
@@ -493,7 +493,7 @@ async def send(self, message: "ASGISendEvent") -> None:
             if message_type != "http.response.body":
                 msg = "Expected ASGI message 'http.response.body', but got '%s'."
                 raise RuntimeError(msg % message_type)
-            message = cast(HTTPResponseBodyEvent, message)
+            message = cast("HTTPResponseBodyEvent", message)
 
             body = message.get("body", b"")
             more_body = message.get("more_body", False)