Bug ID 420837: AAM can duplicate http headers under certain circumstances

Last Modified: Apr 10, 2019

Bug Tracker

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

Known Affected Versions:
11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF9

Opened: May 08, 2013
Severity: 3-Major
Related AskF5 Article:


When a client uses the "Accept-Encoding: identity" request header, AAM is responding with duplicate response headers.


Erroneous duplicate HTTP headers in the response.


AAM and Accept-Encoding: identity in use by client


This issue has no workaround at this time.

Fix Information

AAM no longer duplicates http headers when a client uses the "Accenpt-Encoding: identity" request header.

Behavior Change