Bug ID 1000561: HTTP chunked encoding markers incorrectly passed to HTTP/2 client-side

Last Modified: Nov 06, 2023

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

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 17.0.0,,, 17.1.0,,,

Fixed In:
17.1.1, 16.1.4, 15.1.9

Opened: Mar 09, 2021

Severity: 3-Major


HTTP/2 virtual servers pass the chunk size bytes from the server-side (HTTP/1.1) to the client-side (HTTP/2) when OneConnect and request-logging profiles are applied. This results in a malformed HTTP response.


The HTTP response passed to the client-side includes chunk size header values when it should not, resulting in a malformed HTTP response.


-- BIG-IP configured with a HTTP/2 virtual server using OneConnect and request-logging profiles. -- The pool member sends a chunked response.


Change HTTP response-chunking to either 'unchunk' or 'rechunk' in the HTTP profile for the virtual server.

Fix Information

The HTTP response egressing the client-side no longer includes chunk size bytes.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips