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app.py

@@ -88,7 +88,17 @@ async def transport_middleware(request: Request, call_next):
         body_sent = True
         return {"type": "http.request", "body": body, "more_body": False}
 
-    request = Request(request.scope, receive)
+    scope = dict(request.scope)
+    scope["headers"] = [
+        (
+            key,
+            str(len(body)).encode("latin-1")
+            if key.lower() == b"content-length" else value,
+        )
+        for key, value in request.scope.get("headers", [])
+        if key.lower() != b"content-encoding"
+    ]
+    request = Request(scope, receive)
     request.state.request_id = request_id
     response = await call_next(request)
     response.headers[REQUEST_ID_HEADER] = request_id