Bug ID 1881129: BIG-IP system sends Response HTTP headers without waiting to receive part of the body.

Last Modified: May 19, 2025

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

Known Affected Versions:
17.1.2, 17.1.2.1, 17.1.2.2

Opened: Mar 23, 2025

Severity: 4-Minor

Symptoms

If a misconfigured server waits to send a body, or fails to send one at all, the BIG-IP system waits until the connection ends before sending the response.

Impact

The connection might appear to stall until the server-side sends a body or disconnects.

Conditions

This occurs when the following conditions are met: -- A response indicating a body. -- The headers are smaller than 16 KB. -- The body takes time to arrive, or never arrives at all.

Workaround

The headers can be padded to be larger than 16 KB by an iRule. (This causes the BIG-IP system not to wait.) HTTP::respond might also be useful to emulate a redirect response manually.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips