Why Do Session Cookies Disappear in Chrome, but Not Firefox?
Posted on 2025-03-22
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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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