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from typing import Optional

from fastapi import Cookie, Depends, FastAPI

app = FastAPI()

def query_extractor(q: Optional[str] = None):

return q

def query_or_cookie_extractor(

q: str = Depends(query_extractor), last_query: Optional[str] = Cookie(None)

):

if not q:

return last_query

return q

@app.get("/items/")

async def read_query(query_or_default: str = Depends(query_or_cookie_extractor)):

return {"q_or_cookie": query_or_default}