Bug ID 434834: Portal Access should support conditional caching HTTP headers

Last Modified: Apr 20, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP APM(all modules)

Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5, 14.0.0,,,,,, 14.0.1,

Opened: Oct 22, 2013
Severity: 3-Major
Related AskF5 Article:


Content served with 'Last-Modified' or 'ETag' HTTP headers, and requested with 'If-Modified-Since' or 'If-None-Match' could be loaded from browser cache.


Stale page content and JavaScript errors on pages served through Portal Access after upgrade of APM.


In the case of APM upgrade this means that browser could use content patched with old version of APM Portal Access and this leads to all kinds of compatibility issues with F5 JavaScript code.


Remove 'If-Modified-Since' and 'If-None-Match' headers in HTTP_REQUEST event with iRule.

Fix Information


Behavior Change