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Gerald_Meese's avatar
Gerald_Meese
Icon for Cirrus rankCirrus
May 22, 2018

HTTP::redirect loop

Hello,

I'm trying to write a small iRule to create redirects to specific paths on an internal server based on the presence/absence of the 'order' parameter in the requested URI :

when HTTP_REQUEST {
if { [HTTP::uri] contains "order" } {
    HTTP::redirect /Login.aspx?guestlogin=1&order=[URI::query [HTTP::uri] order]&context=3 }
else { 
    HTTP::redirect /Login.aspx?guestlogin=1 }

}

When I'm testing the iRule I'm running into a loop of "too many redirects" but I don't see what I need to do to correct that... Any help would be highly appreciated !

Thanks in advance 🙂

Gerald

application delivery
iRules
LTM
  • youssef1's avatar
    youssef1
    Icon for Cumulonimbus rankCumulonimbus
    May 22, 2018

    Hi Gerald,

    Your Irule is not correct because it will trigged to each request. either at condition "if" or in each case at "else".

    when HTTP_REQUEST {
if { [HTTP::uri] contains "order" } {
    HTTP::redirect /Login.aspx?guestlogin=1&order=[URI::query [HTTP::uri] order]&context=3 }
else { 
    HTTP::redirect /Login.aspx?guestlogin=1 }
}

    You need to add an additional condition on else like this:

      when HTTP_REQUEST {
if { [HTTP::uri] contains "order" } {
    HTTP::redirect /Login.aspx?guestlogin=1&order=[URI::query [HTTP::uri] order]&context=3 }
elseif {[HTTP::uri] eq "/"} { 
    HTTP::redirect /Login.aspx?guestlogin=1 }
}

    le me now if it's clear...

    Regards

  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    May 22, 2018

    Here is a code which will prevent redirect loops

     

    when HTTP_REQUEST {
     Make sure only the login page matches the code, to prevent all requests to be redirected to login page (like images CSS, and other web pages)
    if {[HTTP::path] equals "/Login.aspx"} {
        set order [URI::query [HTTP::uri] order]
        set context [URI::query [HTTP::uri] context]
         Don't redirect if context already equals 3
        if { $order ne "" && $context != 3 } {
            HTTP::redirect /Login.aspx?guestlogin=1&order=${order}&context=3 
         Redirect if order is null and guestlogin doesn't equal 1
        } elseif {$order == "" && [URI::query [HTTP::uri] guestlogin] ne 1} { 
            HTTP::redirect /Login.aspx?guestlogin=1 
        }
    }
}