Bug ID 433997: ICAP sometimes stops sending data to server after 200-ok following 100-continue

Last Modified: May 29, 2024

Affected Product(s):
BIG-IP LTM, PEM(all modules)

Known Affected Versions:
11.4.0, 11.4.1

Opened: Oct 15, 2013

Severity: 3-Major


After 200-ok following 100-continue, the BIG-IP system ICAP client sometimes stops sending ICAP request body to ICAP server, mid-stream (no ICAP termination).


Server stops receiving data so cannot complete its response. Transaction hangs and adaptation virtual server (with response-adapt profile) will eventually time out and perform its service-down action.


ICAP preview-length >= ADAPT preview-size(lesser is used). Server responds with 100-continue after preview, and later with 200-ok.


Increasing ADAPT preview-size to a few KB greater than ICAP preview-length might reduce the frequency of occurrence.

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips