In theory, this method can achieve re-login, but the actual situation may be more complicated. This is a common method of "cookie hijacking" or "session hijacking", which attempts to re-establish a session by duplicating a valid session cookie.
Here are the prerequisites, possible issues, and caveats for this approach:
prerequisites :
- Session Cookie : You need to make sure that you save the current valid session cookie.
- Not Expired : The saved cookie is still valid (not expired) on reload.
- Same browser and device : In general, this approach is more likely to succeed on the same browser and device.
Possible problems :
- Security measures : Many modern web applications take some security measures, such as checking user agent, IP address, etc., to ensure session persistence. They may invalidate a session if they detect that some parameters of the session have changed.
- HttpOnly : Some secure cookies are set to HttpOnly, which means they cannot be accessed via JavaScript. This can make it difficult to extract them from the browser API.
- Secure Flag : Some cookies may have a Secure flag, which means they can only be sent in an HTTPS context.
- SameSite Policy : As mentioned earlier, depending on the SameSite policy for cookies, you may encounter problems with cross-site requests.
Note :
- Privacy and Security : This approach may expose the user's session cookie, which may lead to security risks. Make sure you follow best privacy and security practices when handling cookies.
- Effectiveness : Due to the possible issues mentioned above, it is better to test this method in a real scenario to ensure its effectiveness.
- Persistence : Session cookies may expire, or become invalid for other reasons (such as a user changing a password).
In conclusion, while this approach might technically enable re-login, it may take some extra effort and testing to make sure it works and is secure in a real-world scenario.