Persistance iRule

Posted By work_hard_play_hard on 08/17/2011 12:12 PM

I used the default cookie persistence profile (insert mode) and applied the iRule you suggested. I believe persistence is working correctly, but the website reports a redirect loop:

If I update the iRule to use HTTP:path and remove the trailing '/' - Will that prevent it from looping, or do I have to use an " & amp & " operators with a string? Any helpful debug log statements are appreciated. Still learning 🙂

when HTTP_REQUEST { 
log local0.debug "using persistence" 
switch -glob [string tolower [HTTP::path]] { 
"/client" { pool athoc_pool_1 }
default { 
persist none 
HTTP::redirect "http://[HTTP::host]/csi"
log local0.debug "using redirect" 
} 
} 
}

-TJ

If you remove the "/" in the manner you suggested the iRULE condition statement will match exactly http://alerts.company.edu/client and then send it over to the alternative pool. It will do a redirect if it's "http://alerts.company.edu/client/something" or "http://alerts.company.edu/client/something/something" , etc. If you use HTTP::path you are basically only seeing the path and not any query strings For example the following URL:

 

 

1 http://www.example.com:8080/main/in...ogin=check

 

 

 

 

 

The path is:

 

 

1 /main/index.jsp

 

 

 

 

 

Note that only ? is used as the separator for the query string. So, for the following URL:

 

 

1 http://www.example.com:8080/main/in...ogin=check

 

 

 

 

 

the path is:

 

 

1 /main/index.jsp;session_id=abcdefgh

 

 

 

 

As you can see HTTP::path doesn't contain query string which is not the entire URL.

So if you are okay with that you can proceed to use it. However, i would further investigate whether the loop is explicitly being caused by the webserver or the iRULE itself.

I hope this helps

Bhattman