[Python] Question mark in POST method using FastAPI returns 404 error

Could you please explain to me why in FastAPI the following works:

@app.post("/items/v1/cards{sku}")
async def create_item(sku: str):
return {"status":200,"sku":sku} # returns status:200 and sku


but, the same endpoint with questionmark in it like the one given below does not?

@app.post("/items/v1/cards?{sku}")
async def create_item(sku: str):
return {"sku":sku} # returns 404

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