how can i troubleshoot an irules logic

So by explicit proxy, do you mean explicit to the browser? Where the Host header from the browser contains the full URL to the remote host?

kevin

yes, the ltms ip address is configured as the proxy in the browser settings

when i a http request is made for http://10.27.1.254 to source address is my client, the destination address is the ltm vserver address

the http host filed contains 10.27.1.254:8080

hope this helps

Ahh, so that makes sense. You're using the IP address in the browser request, so that IP address will be in the Host header that passes through the forward proxy. That's the only place you'll be able to get the destination address then. What if, however, the client requests something by name instead of IP address? Have you configured a DNS lookup in your iRule? Will that be required?

kevin

dns is handled by the upstream proxies

using a string data group works but its not the solution i hoped for

my string looks for 10. but this obviously means if someone requests a public ip as 180.50.10.5 (random example) my irule will pick it up and send it to the external proxy (PROXY-POOL)

i'm not sure if http::host will pick up the string http://10. but i think i've got a workaround but i don't think its a long term solution

thanks again for your patience and help