[Python] FastAPI/Starlette's SessionMiddleware creates new session for every request

I need to create a session for authentication in the session_set endpoint. However, for some reason, the session is still being created in the session_info endpoint. How to make a session created only in session_set? Otherwise, I have a new session in the response with each request.

Here is my code:

import uvicorn
from fastapi import FastAPI, Request
from starlette.middleware.sessions import SessionMiddleware

app = FastAPI()
app.add_middleware(SessionMiddleware, secret_key="some-random-string", max_age=None)


@app.get("/a")
async def session_set(request: Request):
request.session["my_var"] = "1234"
return 'ok'


@app.get("/b")
async def session_info(request: Request):
my_var = request.session.get("my_var", None)
return my_var


if __name__ == '__main__':
uvicorn.run('http-session:app', port=5000, reload=True)






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