Last Modified: Jul 18, 2026
Affected Product(s):
BIG-IP ASM
Known Affected Versions:
11.6.1, 11.6.1 hf1, 11.6.1 hf2, 11.6.2, 11.6.2 hf1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.0.0, 12.0.0 hf1, 12.0.0 hf2, 12.0.0 hf3, 12.0.0 hf4
Fixed In:
12.1.0
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.
N/A
Any method beside GET and HEAD is allowed to be with a "Expect 100-continue" header, and the relevant behavior is supported.