Why Do Session Cookies Disappear in Chrome, but Not Firefox?

Session Cookies Misbehaving Solely in Chrome

While navigating within a shopping cart application, a peculiar issue surfaced: session data stored was retained in Firefox but mysteriously vanished in Google Chrome. Despite correct session initialization procedures, variables such as 'last_viewed_element' were persistently lost in Chrome.

This behavior extended to all session variables, as evidenced by the lack of response in Chrome upon accessing $_SESSION. However, upon delving into the network monitor, it was clear that session cookies were being transmitted.

Unconventional Solution: Replacing Sessions with Cookies

To resolve this puzzle, an unorthodox solution was discovered. By switching from session cookies to regular cookies, the issue vanished.

Underlying Cause: Chrome's Response to 404 Error

Further investigation revealed that Chrome was triggering a 404 error due to a missing favicon.ico. This 404 call executed the footer script, which subsequently altered the session variables, explaining their disappearance.

This unusual phenomenon highlights the importance of considering potential interactions between browser-specific behavior and session handling in web applications.

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