Sync fastapi docs from b5ca1324 on 2025-12-07

docs_src/additional_responses/tutorial002.py

@@ -0,0 +1,30 @@
+from typing import Union
+
+from fastapi import FastAPI
+from fastapi.responses import FileResponse
+from pydantic import BaseModel
+
+
+class Item(BaseModel):
+    id: str
+    value: str
+
+
+app = FastAPI()
+
+
+@app.get(
+    "/items/{item_id}",
+    response_model=Item,
+    responses={
+        200: {
+            "content": {"image/png": {}},
+            "description": "Return the JSON item or an image.",
+        }
+    },
+)
+async def read_item(item_id: str, img: Union[bool, None] = None):
+    if img:
+        return FileResponse("image.png", media_type="image/png")
+    else:
+        return {"id": "foo", "value": "there goes my hero"}