I am using Python FastAPI and Jinja2, all of which I am new to. I am able to set cookies alone or return html templates on their own, but I cannot work out how to do both at once. Setting cookies only works as expected, but returning a template seems to overwrite that and just returns html with no cookies. @app.get("/oauth/auth", response_class=HTMLResponse) async def login_page(request: Request, response: Response): client_Code_Req_Schema = ClientCodeReqSchema(client_id=request.query_params.get("client_id"), redirect_uri=request.query_params.get("redirect_uri"), response_type=request.query_params.get("response_type")) if check_client(client_Code_Req_Schema): response.set_cookie(key="redirect_uri", value="test") return templates.TemplateResponse("authorize.html", {"request": request}) else: raise HTTPException(status_code=400, detail="Invalid request") Many thanks for any advice. Happy to provide more info if I missed something. Continue reading...