Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

bc1's avatar
bc1
Icon for Nimbostratus rankNimbostratus
Nov 28, 2017

HTTP::Collect results in garbled HTTP::Payload when using non-english characters

Hi there, I'm using an irule to collect a POSTed payload, manipulate the content and then POST on to the back-end pool, however when non-english characters are used then the collected payload is ga...
application delivery
http collect
http payload
irules
LTM
special characters
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Nov 29, 2017

Hi bc,

the programming language of iRules is TCL which uses always UTF-8 to represent a string. If your input contains highbit ASCII charcters (e.g. Win1252, Latin-1, ISO-8859-1) certain TCL commands will silently change the used encoding.

To reformat UTF-8 back to its ASCII representation you could try a 

set output [binary format A* $input]
. By doing so the UTF-8 encoded string representation of the 
$input
will shimmer to a binary 
$output
which is encoded in plain-ASCII.

Cheers, Kai