How to check if a cookie is set in FastAPI?

user_32043 0
Viewed 9938

I defined an optional cookie parameter and now want to check if the cookie was set. Unfortunately, the variable does not equal to None but to an empty Cookie object. How can I check the cookie object if it is set?
Here's how I defined the cookie parameter:

@app.route("/graphcall")
def graphcall(request: Request, ads_id: Optional[str] = Cookie(None)):
    if ads_id:
      # Do stuff if the ads_id is set
fastapi python
4 Answers

I assume you tried this via SwaggerUI. Setting Cookie values currently does not work via SwaggerUI due to browser security restrictions.

@app.get("/items/")
async def read_items(ads_id: Optional[str] = Cookie(None)):
    if ads_id:
        answer = "set to %s" % ads_id
    else:
        answer = "not set"
    return {"ads_id": answer}

works perfectly from command line with Fastapi 0.61.0

$ curl -X GET "http://127.0.0.1:8000/items/" -H  "accept: application/json" -H  "Cookie: ads_id=foobar"
{"ads_id":"set to foobar"}

$ curl -X GET "http://127.0.0.1:8000/items/" -H  "accept: application/json"
{"ads_id":"not set"}
user_142527960

For me this works

async def setcookie(request: Request, nm: str = Form(...)):
    print("setcookie "+nm)
    response = templates.TemplateResponse("readcookie.html",{"request": request})
    response.set_cookie(key="userID", value=nm)

@app.get("/getcookie/", response_class=HTMLResponse)
async def getcookie(request: Request,userID: Optional[str] = Cookie(None)):
    if userID:
        print("getcookie "+userID)
    else:
        print("getcookie None")
    return templates.TemplateResponse("showcookie.html", {"request": request, "name": userID})

In getcookie I have the cookie set in setcookie.

I follow this approach:

https://fastapi.tiangolo.com/advanced/response-cookies/#return-a-response-directly

user_146867050

I still don't understand why the Optional[str] = Cookie(None) method didn't work. For me this way worked

@router.post('/login')
async def sign_in(
        user_data: OAuth2PasswordRequestForm = Depends(),
        service: AuthService = Depends(),
):
    session = await service.authenticate_user(
        user_data.username,
        user_data.password
    )
    response = RedirectResponse(url='/')
    response.set_cookie('Authorization', value=session['session_id'], httponly=True)
    return response


async def get_current_user(request: Request): 
    try:
        cookie_authorization: str = request.cookies.get("Authorization")
        # some logic with cookie_authorization
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail="Invalid authentication"
        )
user_92623390

I think the problem is that you put

ads_id: Optional[str] = Cookie(None)

Try

async defer(cookie_token: Optional[std] = Cookie(default=None)):
user_145906850
Related