[Python] FastAPI/Starlette's Request object is empty when used in a normal function

When I use request inside a FastAPI route, the request is filled with the proper headers, such as:

request.headers.get('X-Forwarded-For')


However, when I use the request object inside a function, which isn't a route, all the values are empty. I guess the whole object is not evaluated?

Working:

from fastapi import Request


@app.get("/logip")
async def log_request_ip(request: Request):
print(request.headers.get("X-Forwarded-For))


Not working:

from fastapi import Request


@app.get("/logip")
async def log_request_ip():
log_ip()


def log_ip(request: Request = Request):
print(request.headers.get("X-Forwarded-For))


Is there a reason for this? Does FastAPI only evaluate the request object when it is injected into the route, but not in a function? Is there any way to make this possible? I want to avoid injecting the request into every route, and just keep this in the function that actually uses this value.

Is there maybe a way to tell FastAPI that this function is only used within a request context?

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