LTM as a proxy asking username/password

So what about if you add some more logging. Do you get anything then?

when HTTP_REQUEST {
    log local0. "Testing Proxy-Authorization"

    log local0. "  Headers:"
    foreach name [HTTP::header names] {
        log local0. "    ${name}: [HTTP::header value $name]"
    }

    if { not ([HTTP::header exists "Proxy-Authorization"]) } {
        log local0. "  NO PROXY-AUTHENTICATE HEADER. Returning 407"
        HTTP::respond 407 Proxy-Authenticate "BASIC realm=\"PROXY X\""
    } else {
        log local0. "  PROXY-AUTHENTICATE HEADER exists."
        log local0. "    Value: [HTTP::header value "Proxy-Authorization"]"

        set proxyauth [lindex [split [HTTP::header value "Proxy-Authorization"] " "] 1]
        set username [lindex [split [b64decode $proxyauth] ":"] 0 ]
        set password [lindex [split [b64decode $proxyauth] ":"] 1 ]
        log local0. "    PROXY-AUTHORIZATION HEADER IS $proxyauth, USERNAME IS $username AND PASSWORD IS $password"
        if {not ($username equals "useraaa" and $password equals "aaauser") } {
            HTTP::redirect "http://sorrypage.aaaaa.com"
        }
    }
}