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How to Check If A Cookie Is Set In Fastapi?

3 minutes read

You can check if a cookie is set in FastAPI by accessing the request object using the dependency injection feature. You can then check if the cookie is set by using the cookies attribute of the request object. If the cookie you are looking for is set, it will be present in the cookies dictionary. You can access the value of the cookie by using its key. If the cookie is not set, the key will not be present in the cookies dictionary.


How to set the SameSite=None attribute for a cookie in FastAPI?

To set the SameSite=None attribute for a cookie in FastAPI, you can use the set_cookie method provided by the Response class. Here's an example of how to set the SameSite=None attribute for a cookie in FastAPI:

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from fastapi import FastAPI, Response

app = FastAPI()

@app.get("/")
async def get_cookie(response: Response):
    response.set_cookie(
        key="my_cookie",
        value="example value",
        samesite="None"
    )
    return {"message": "Cookie set with SameSite=None attribute"}


In this example, the set_cookie method is used to set a cookie named "my_cookie" with the value "example value" and the SameSite attribute set to "None". When the client receives the cookie, it will be allowed to be sent back in cross-site requests.


Remember to use caution when setting the SameSite attribute to None as it may have security implications. Make sure that you understand the implications and requirements for your specific use case before setting the SameSite attribute to None for a cookie.


What is the SameSite=None attribute in cookies?

The SameSite=None attribute in cookies is a directive that specifies that a cookie can be sent in a cross-origin request. This attribute is used to prevent certain types of cross-site request forgery (CSRF) attacks by restricting when cookies can be sent in a request. Cookies with the SameSite=None attribute set can be sent in cross-origin requests, such as when loading resources from a different domain, while cookies without this attribute are restricted to same-site requests only. This attribute is commonly used in conjunction with the Secure attribute to ensure that sensitive cookies are only sent over secure connections.


What is the SameSite attribute of a cookie in FastAPI?

The SameSite attribute of a cookie in FastAPI allows you to specify how cookies should be sent along with cross-origin requests. It can have three possible values: "Strict", "Lax", or "None".

  • "Strict" means that the cookie will only be sent in a first-party context and not in cross-origin requests.
  • "Lax" means that the cookie will be sent in cross-origin "safe" requests, such as GET requests triggered by a top-level navigation.
  • "None" means that the cookie will be sent in all cross-origin requests.


By default, FastAPI sets the SameSite attribute of cookies to "Lax" to provide some protection against cross-site request forgery (CSRF) attacks. However, you can customize this behavior by explicitly setting the SameSite attribute when creating cookies in your application.


What is the expiration time for cookies in FastAPI?

The expiration time for cookies in FastAPI can be set using the max_age parameter when setting the cookie. This parameter represents the number of seconds until the cookie should expire. By default, the cookie will expire when the user's browser is closed (session cookie).


How to limit cookie access to a specific domain in FastAPI?

To limit the access of cookies to a specific domain in FastAPI, you can set the domain parameter when setting the cookies using the Response.set_cookie() method. Here's an example:

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from fastapi import Cookie, FastAPI, Response

app = FastAPI()

# Set a cookie with specific domain
@app.get("/set-cookie")
async def set_cookie(response: Response):
    response.set_cookie(key="my_cookie", value="cookie_value", domain="example.com")
    return {"message": "Cookie set successfully"}


In this example, the domain parameter is set to "example.com", which restricts the cookie to be accessed only by the specified domain. You can change the domain value to your desired domain.

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