iRule error after upgrade version (Operation not supported. Multiple redirect/respond invocations not allowed)

Hi Ciao,

this error would happen if a previous rule had already responded the request and you try to respond a second time to the very same request. The return command unfortenately doesn't stop the processing of following iRules...

You may either combine those rules into a single one and then

return

[HTTP::respond]

when HTTP_REQUEST {
   if { [string tolower [HTTP::path]] equals "/something.txt" } {
      HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
      return
   }
   if { [string tolower [HTTP::path]] equals "/somethingother.txt" } {
      HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
      return
   }
}

... or you may inform the later iRules that the request is already responded...

when HTTP_REQUEST {
   set already_responded 0
   if { [string tolower [HTTP::path]] equals "/something.txt" } {
      HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
      set already_responded 1
      return
   }
}
when HTTP_REQUEST {
   if { $already_responded } {
        do nothing
   } else {
       if { [string tolower [HTTP::path]] equals "/somethingother.txt" } {
          HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
          return
       }
   }
}

Note: Keep in mind to trigger a

set already_responded 0

A third option would be to see if a response is already send to the client by trying to minipulate the REQUEST or RESPONSE headers and [catch] the error which would happen if a response is already send. But this could have a certain performance impact.

when HTTP_REQUEST {
   if { [catch {HTTP::payload replace 0 0 {}}] } then { 
        do nothing
   } else {
       if { [string tolower [HTTP::path]] equals "/something.txt" } {
          HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
          return
       }
   }
}

when HTTP_REQUEST {
   if { [catch {HTTP::payload replace 0 0 {}}] } then { 
        do nothing
   } else {
       if { [string tolower [HTTP::path]] equals "/somethingother.txt" } {
          HTTP::respond 200 content "User-agent: * \nDisallow: /somretyhing.pe \nAllow: /"
          return
       }
   }
}

Cheers, Kai