No matches under XML_CONTENT_BASED_ROUTING

Yes, seems I need some assistance with STREAM

My setup uses Layered-VS scenario (LTM_VS forwarding to APM_VS with help of simple iRule). APM_VS is used for Exchange Server publication (EWS protocol mainly). LTM_VS has datasafe and stream profiles attached. There is another iRule also which is doing simple replace string1 with string2 under HTTP_REQUEST event (this iRule is attached to LTM_VS)

Seems that after enabling stream engine with STREAM::enable under HTTP_REQEUST any  Content-Length header is replaced with Transfer-Encoding: chunked. According to F5 docs this is normal behavior. Unfortunately this setup breaks EWS protocol

I compared TCPDUMP captures from working and non-working scenario. And found that Exchange server could answer to authentication requests with Transfer-Encoding: chunked but will not answer to EWS SOAP payload after successful authentication. If EWS SOAP payload came with Content-Length header everything is fine

So my question is: how can I use stream profile and unchunk resulted HTTP packet to be sent to Exchange with Content-Length header instead of Transfer-Encoding: chunked?

I tried adding this iRule to APM_VS under HTTP_REQUEST but nothing changed. TCPDUMP showed that Transfer-Encoding: chunked is still present in the packet that goes to Exchange server

if {[HTTP::header exists "Transfer-Encoding"]} {
    HTTP::header remove "Transfer-Encoding"
    HTTP::payload unchunk
}