Sync fastapi docs from 11614be9 on 2026-03-11

docs_src/custom_response/tutorial009_py310.py

@@ -0,0 +1,10 @@
+from fastapi import FastAPI
+from fastapi.responses import FileResponse
+
+some_file_path = "large-video-file.mp4"
+app = FastAPI()
+
+
+@app.get("/")
+async def main():
+    return FileResponse(some_file_path)