Redirect Irule For a specific URL to a Web Proxy

A bit more information would be useful, but is this what you are after?

if {[string toupper [HTTP::method]] eq "CONNECT"} {
    pool 
} 

i have my default web proxy pool but when a user tries to open for example google.com go to another pool that is a diffren web proxy

Try;-

if {[string toupper [HTTP::method]] eq "CONNECT" && [HTTP::host] starts_with "google.com"} {
    pool 
} 

ill try thanks

hmm does not compile i was able to change it so but it does not redirect when HTTP_REQUEST { if { [string toupper [HTTP::method]] eq "CONNECT" && [HTTP::host] starts_with "google.com" } { pool second-webporxy } } any ideas?

For testing, put in a few logging statements;

log local0. [HTTP::request]
 if { [string toupper [HTTP::method]] eq "CONNECT" && [HTTP::host] starts_with "google.com"} {
    pool second-webproxy
    log local0. "Selecting pool second-webproxy"
} 

Then check /var/log/ltm to see your log statements - you should be able to work out where it is going wrong. Also - make sure you have the oneconnect profile assigned to your virtual server so that it examines each request.