substr doesnt work as expected

There is nothing wrong with your script. The http_host contains the FQDN portion of the URL. Since it contains only the FQDN, it will never match your string compares to the protocol.

 

 

Per the 4.6.2 documentation:

 

 

The http_host variable specifies the value in the Host: header of the HTTP request. It indicates the actual FQDN that the client requested. Possible values are a FQDN or a host IP address in dot notation.

 

 

So, a uri splits out like this:

 

 

http://{http_host}{http_uri}

 

 

Unfortunately, I don't see a simple way to pick out the protocol portion of the whole URL from within iRules. I'll ask around with the other rules folks here on the 4.x team to see if they have another workaround but at this point I believe that you'll have to have a separate rule for your http and https VIPs.