Sorry page redirect

Question

Im trying to set up an iRule that will redirect traffic to an IIS server when there are no active pool members. I have the basics working. However the sorry page will only display properly the first time if there is a uri. If the user refreshes the page or tries a different uri they get a 404.
when HTTP_REQUEST {
    if { [active_members [LB::server pool]] &lt; 1} {
        HTTP::uri "/"
        pool /ESI/solr.erp-pool
    }
}

How would i configure this irule to apply every time the user refreshes the page or hits the url again?

iheartf5_45022 · Answer

Make sure you have oneconnect enabled. I think that should fix it.&nbsp;

pgsmith_120398 · Answer

Is there an alternate method? This sorry rule will be used on hundreds of websites some of which can not use the one connect profile. I tried redirecting to the host instead of removing the uri with no luck. I can redirect to another URL that points to a sorry page VS but I would prefer the user doesn't see a URL host change.

HTTP::redirect "http://[HTTP::host]"

iheartf5_45022 · Answer

Yes there is a workaround.  Try this;-
when CLIENT_ACCEPTED {
    set def_pl [LB::server pool]
}
when HTTP_REQUEST {
    if {![active_members $def_pl]} {
        HTTP::uri "/"
        pool /ESI/solr.erp-pool
    } else {
        pool $def_pl
    }
}

pgsmith_120398 · Answer

I'm sorry if this is a stupid question but could you explain how this rule differs from my original. It looks like it does the same thing in a different manner.

iheartf5_45022 · Answer

Sorry I was running out the door to lunch when I posted that.  Now I have food I can explain;-&nbsp;
Without oneconnect enabled, each time HTTP_REQUEST is enabled,  the current pool will be the last one selected on the same TCP connection,  previous HTTP_REQUEST.  So using your iRule,  let's say your pool members are down and you invoke the /ESI/solr.erp-pool pool.  The next time HTTP_REQUEST is executed,  the pool returned by [LB::server pool] will be /ESI/solr.erp-pool.  When you check it for active members,  it will have them,  so you send the request to it.  Unfortunately you are sending a path other than "?" so you get a 404 .&nbsp;
My rule simple saves the default pool so that it is the one you always check for active members.  In addition if the current pool does have active members it will explicitly select the default pool - just in case your default pool goes down and then come back up.&nbsp;
I hope that makes sense.&nbsp;

Forum Discussion

Sorry page redirect

8 Replies

AppWorld Berlin 2026 – iRules Contest Winning Results

One Quick Step to Make your website AI-Agent/MCP Ready with an iRule

IPv8 Would Fix My Routing Tables. It Will Never Ship.

Recent Discussions

Errors with AS3 3.56.0 with F5 17.5.1.6

syslog over tcp and define management IP as source

VIP control across data centers - how to ensure only 1 VIP is up at a time?

migrate from serie I to R. Cluster LTM-GTM

CPU/vCPU sizing on rseries