issue with STREAM macthing

hi

trying to have Password Manager Pro working in APM Portal mode. I have such response from server

HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Strict-Transport-Security: max-age=7776000; includeSubdomains
X-FRAME-OPTIONS: SAMEORIGIN
Cache-Control: no-cache
Content-Type: text/html;charset=UTF-8
Content-Length: 7444
Date: Wed, 26 Aug 2015 15:20:26 GMT



    
[...]
function newRDP(params)
{
    // var w = 1176, h = 551, server_bpp = 16;
    // var w = 1280, h = 780, server_bpp = 16;
    //var w = 1280, h = 610, server_bpp = 16;
    var w = window.innerWidth-10, h = window.innerHeight-10, server_bpp = 16;

    var protocol = ("https:" == location.protocol) ? "wss://" : "ws://";// No I18N
    var r = svManager.getInstance(); 
    params = params + "&mapClipboard=on";//No I18N
    r = new svGlobal.Rdp( protocol + 'pmanagerpro.customer.com'+ ":"+7273+"/RDP?" + params, w, h, server_bpp);// No I18N
    //alert(params + ' ' +w + ' ' +h);
    //console.log(params + ' ' +w + ' ' +h);
[...]

want to match

'pmanagerpro.customer.com'+ ":"+7273+"/RDP?"

Wrote the stream irule

when HTTP_REQUEST {
STREAM::disable
HTTP::header remove Accept-Encoding
}

when ACCESS_ACL_ALLOWED {
STREAM::disable
HTTP::header remove Accept-Encoding
}



when HTTP_RESPONSE {

set toreplace "\'pmanagerpro.customer.com\'+ \":\"+7273+\"/RDP?"
set replacestring "\'1.1.1.1/f5-w-68747xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx$$/RDP?\'"
STREAM::disable

if {[HTTP::header Content-Type] contains "text"}{     
   STREAM::expression "@$toreplace@$replacestring@"
    STREAM::enable
log local0. "string1= $toreplace    &&&&&  string2= $replacestring"
}
}

when enabled, the logging shows the

toreplace

variable be exactly what I want to match. But the match doesn't work (client gets the original content)

Thank you

Alex