Sync fastapi docs from 50fa3f7c on 2026-01-11

docs_src/dependencies/tutorial008b_py39.py

@@ -0,0 +1,30 @@
+from fastapi import Depends, FastAPI, HTTPException
+
+app = FastAPI()
+
+
+data = {
+    "plumbus": {"description": "Freshly pickled plumbus", "owner": "Morty"},
+    "portal-gun": {"description": "Gun to create portals", "owner": "Rick"},
+}
+
+
+class OwnerError(Exception):
+    pass
+
+
+def get_username():
+    try:
+        yield "Rick"
+    except OwnerError as e:
+        raise HTTPException(status_code=400, detail=f"Owner error: {e}")
+
+
+@app.get("/items/{item_id}")
+def get_item(item_id: str, username: str = Depends(get_username)):
+    if item_id not in data:
+        raise HTTPException(status_code=404, detail="Item not found")
+    item = data[item_id]
+    if item["owner"] != username:
+        raise OwnerError(username)
+    return item