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awakenings's avatar
awakenings
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Jul 14, 2022

Issues to forward requests with 'start with' due to similar contexts under same domain

Hi everybody,

A network request that seemed to be simple is giving some trouble to our network team, I'd appreciate some help.
Here's a summary of the rules to be put in place:

1) example.domain.com/cali --> forward to server1

2) example.domain.com --> forward to server2

When creating the rule with "URI starts with" from web interface it works, but there's a side effect: requests like example.domain.com/california are matching rule 1) and therefore failing, since that context is managed by some Apache at server2.

They've tried using 'IS' instead 'STARTS WITH' for /cali but then, when trailing slash is not added, it fails. It also fails when calling something like /cali/ad
Since we don't know what other possible contexts might be requested, we want just to add a rule for /cali and leave everything else (/california , /calisthenics, ...) under rule 2)

What's the issue here? Is something like it possible just using the web interface or are iRules needed? Any examples?



Thanks a lot in advance

cloud
forwarding
irule
  • StephanManthey's avatar
    StephanManthey
    Jul 15, 2022

    Hi awakenings ,

    you might use the regexp, but using globbing is probably less CPU intensive:

    when HTTP_REQUEST {
   # Check the requested path (set to lowercase)
   # -glob: allow string pattern matching
   switch -glob -- [string tolower [HTTP::path]] {
      "/cali" -
      "/cali/" -
      "/cali/*" {
         log local0. "Matched pool 1 paths for [HTTP::uri]"
         pool pool1
      }
      "/california" -
      "/california/" -
      "/california/*"  {
         log local0. "Matched pool 2 paths for [HTTP::uri]"
         pool pool2
      }
      default {
         log local0. "Hit default for [HTTP::uri]"
         pool pool_default
      }
   }
}

    This will send traffic to /cali and following segments to pool1 while traffic to /california and following segments will be forwarded to pool2.