Bug ID 557508: "Expect 100-continue" support

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
10.2.4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3,,,,, 11.6.4, 11.6.5,,,, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:

Opened: Nov 11, 2015
Severity: 3-Major


ASM supports "Expect 100-continue" behavior only for the POST method.


such a request will not be passed to server, instead it will hang and expire on a timeout.


if for example, a client sends a request with PUT method, "Expect 100-continue" header, and a body.



Fix Information

Any method beside GET and HEAD is allowed to be with a "Expect 100-continue" header, and the relevant behavior is supported.

Behavior Change