Bug ID 450136: Occasionally customers see chunk boundaries as part of HTTP response

Last Modified: May 29, 2024

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

Known Affected Versions:
11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.1, 11.6.2, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.1.0 HF1, 12.0.0 HF2, 12.1.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.1 HF1, 12.1.1 HF2, 12.1.2 HF1, 12.1.2 HF2, 12.1.1, 12.1.2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Fixed In:

Opened: Feb 25, 2014

Severity: 2-Critical

Related Article: K16778


Occasionally, users see chunk boundaries as part of HTTP response if the virtual server is configured with rewrite profile variant and some other profiles.


End users may see random characters displayed on their web pages, or the page may fail to render because it contains invalid HTML markup.


Virtual server with rewrite profile variant and some other profiles like OneConnect and NTLM could cause HTTP response to be double-chunked.


To workaround this problem, use an iRule to rechunk the HTTP response always.

Fix Information

Simple iRule is added inside code to rechunk the response in HTTP_RESPONSE event when the content is already chunked by backend/application servers.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips