Is it possible to insert HTTP payload in an ICAP reply or to change the status code?

Finally got some time to review this as if it is possible and seems not. 

On the internal VS that connects to the ICAP server I tried to use TCP::respond and just it does not work in any event even CLIENT_ACCEPTED or SERVER_CONNECTED. The only way is to use the HTTP headers and the event ADAPT_REQUEST_HEADERS on the F5 standard VS.

when CLIENT_ACCEPTED {

set html_message "Access Denied"

TCP::respond "HTTP/1.1 405 Not Allowed Mime-Type: text/html\r\nCache-Control: no-cache,no-store\r\nConnection: close\r\nContent-Length: [string length $html_message]\r\n\r\n$html_message\r\n\r\n"

}