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 garbled even before I start any processing:

If I post for example:

â ê î ô û á é í ó ú ü ñ

I get the following in HTTP_REQUEST_DATA:

â ê î ô û á é í ó ú ü ñ

I've looked through devcentral but the examples don't seem to relate to this or else they relate to the URI .. Is there a best-practice on how to correct this?

Many thanks!

when HTTP_REQUEST {
  HTTP::collect 1048576
}

when HTTP_REQUEST_DATA {
  log local0. [HTTP::payload]
}