Laravel 419 Error for Some Mobile Users Despite Correct CSRF Implementation

Question

I'm encountering a persistent issue with my Laravel application where some users experience a 419 error. This happens inconsistently and primarily affects mobile users. Despite following various solutions, the problem persists for a subset of users.

Issue Details:

1. Error: Users receive a 419 error (Page Expired) on certain requests.
2. Occurrence: The error occurs for some users, not all. It seems random and primarily affects users on mobile browsers.
3. Testing: I have tested extensively on Chrome and Firefox on both my laptop and mobile, and I cannot reproduce the error myself.
4. Observed Behavior: Logs indicate that a new session is being created for each request for users experiencing this issue.

Solutions Tried:

1. CSRF Token: Ensured that the CSRF token is included in the form.
2. Session Configuration: Checked and confirmed the settings in config/session.php, including the SESSION_DOMAIN setting.
3. Session Expiry: Verified the session expiry settings.
4. User System Time: Ensured that the system time of users is correct.
5. Session Storage: Verified that session files are being created correctly on the server.
6. Mobile Browsers: The issue seems to occur only for users on mobile browsers, though I haven't been able to replicate it on my own mobile browser.
7. AJAX Usage: I do not use AJAX in my application.

Request:

1. Debugging Steps: How can I effectively debug this issue and pinpoint the cause?
2. Logger Usage: How should I utilize Laravel's logging system to capture relevant information? Where exactly should I place the logging code to capture the session creation and CSRF validation process?
3. Past Experiences: Has anyone encountered a similar issue before? What potential causes should I investigate further?

References:

I have already looked into the following Stack Overflow posts but they did not resolve my issue:

• Post Request in Laravel Error 419
• 419 Page Expired in Laravel even after adding CSRF token

Any insights or suggestions would be greatly appreciated. Thank you!