Getting Started with iRules: Intro to Programming with Tcl

Hello.

In my case, the pool was configured directly into the VS, but it's also possible to do it in the iRule.

REF - https://clouddocs.f5.com/api/irules/pool.html

There you have examples of how to select pools base on URI.

Regards,

Dario.

Hello Strich.

Using a pool is relatively easy. With this iRule I'll have everything working properly

when HTTP_REQUEST {
    set url "https://[getfield [HTTP::uri] "URL=" 2]"
    set host [URI::host $url]
    set path [URI::path $url]
    set basename [URI::basename $url]
    HTTP::uri $path$basename
    HTTP::host $host
}

If I test it with curl I've got this:

# CUSTOMER REQUEST TO BIG-IP
GET /URL=www.wyz.com/app HTTP/1.1
User-Agent: curl/7.19.7
Accept: */*
Host: www.abc.com
 
# BIG-IP REQUEST TO BACKEND
GET /app HTTP/1.1
User-Agent: curl/7.19.7
Accept: */*
Host: www.wyz.com

If you don't want to specify a pool in order to use it for a generic purpose then you need to include more logic in that iRule. One possible way to get your goal is to construct a sideband connection.

REF - https://clouddocs.f5.com/api/irules/HTTP-Super-SIDEBAND-Requestor-Client-Handles-Redirects-Cookies-Chunked-Transfer-APM-Access-etc.html

Try it, but from my perspective, it's better to configure an Access Portal using APM instead of configure that with an iRule. The URL structure is going to be slightly different, but it will be easier to configure it.

This is the URL structure using an Access Portal:

www.abc.com/f5-w-<HEX_equivalent_of_backend_FQDN>$$/uri

If this was helpful, please don't forget to mark my answer as "the best" to help me for the contribution.

Regards,

Dario.