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

docs_src/header_params/tutorial002_py39.py

@@ -0,0 +1,12 @@
+from typing import Union
+
+from fastapi import FastAPI, Header
+
+app = FastAPI()
+
+
+@app.get("/items/")
+async def read_items(
+    strange_header: Union[str, None] = Header(default=None, convert_underscores=False),
+):
+    return {"strange_header": strange_header}