Improvements and fixes to fastapi example

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
       uses: astral-sh/setup-uv@v4
 
     - name: Set up Python
-      run: uv python install
+      run: uv python install 3.13
 
     - name: Install dependencies
       run: |

03-fastapi/README.md

@@ -1,9 +1,5 @@
 # FastAPI + Jinja2 Example
 
-Warning: Python support in Workers is experimental and things will break. This
-example is meant for reference only right now; you should be prepared to update
-your code between now and official release time as APIs may change.
-
 ## How to Run
 
 First ensure that `uv` is installed:

03-fastapi/src/worker.py

@@ -5,14 +5,6 @@
 environment = jinja2.Environment()
 template = environment.from_string("Hello, {{ name }}!")
 
-
-class Default(WorkerEntrypoint):
-    async def fetch(self, request):
-        import asgi
-
-        return await asgi.fetch(app, request.js_object, self.env)
-
-
 app = FastAPI()
 
 
@@ -33,3 +25,10 @@ async def env(req: Request):
     env = req.scope["env"]
     message = f"Here is an example of getting an environment variable: {env.MESSAGE}"
     return {"message": message}
+
+
+class Default(WorkerEntrypoint):
+    async def fetch(self, request):
+        import asgi
+
+        return await asgi.fetch(app, request.js_object, self.env)