Bug ID 542581: WebSafe alerts with HTML attached cause the page to run slowly

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP FPS(all modules)

Known Affected Versions:
11.6.0, 12.1.0, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Fixed In:

Opened: Aug 31, 2015

Severity: 3-Major


When 'Attach HTML to alerts' is enabled, large webpages might run slowly.


Page may experience a noticeable delay in reacting to user actions.


-- 'Attach HTML to alerts' is enabled. -- Page source is large. -- WebSafe alert is sent. -- Using Microsoft Internet Explorer version 8 (IE8) or earlier browser version.


Disable 'Attach HTML to alerts'. Use beforeloadfunction to disable only on IE8: function(c){ function isOldIE(ver) { var ua = navigator.userAgent.toLowerCase(); return (ua.indexOf('msie') > -1) ? parseInt(ua.split('msie')[1]) <= ver : false; } if (isOldIE(8)) { c.A.B.P = false; } }

Fix Information

HTML encoding for WebSafe alerts is now faster and can be configured to send only a section of the page source.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips