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Village_Idiot's avatar
Village_Idiot
Icon for Nimbostratus rankNimbostratus
Nov 16, 2022

Capture part of URL to redirect to another

I have a request to redirect from one URL to another based on the word "LOAN" in the query part of the URL. They only want to keep a random length string from the old URL to the redirected one Examp...
application delivery
  • CA_Valli's avatar
    CA_Valli
    Nov 17, 2022

    Hello there,
    if the requested information is always stored in variable KT1112_0_0_0= at request time, this script will capture exact variable value (not bound to length) and insert it in redirect url as acctNum value

    when HTTP_REQUEST {
  if { [HTTP::uri] contains "LOAN" }{
    set acctNum [findstr [HTTP::query] "KT1112_0_0_0=" 13 &]
    HTTP::redirect "https://website2.domain.com/path/app.aspx?acctNum=$acctNum&acctType=LOAN&type=Documents"
	}
}

    It's working in my lab

Village_Idiot's avatar
Village_Idiot
Icon for Nimbostratus rankNimbostratus

This worked, but I had to make an adjustment to the findstr as it wasn't working. Here is the final iRule

when HTTP_REQUEST {
  if { [HTTP::uri] contains "LOAN" }{
    set acctNum [findstr [HTTP::query] "=" 1 &]
    HTTP::redirect "https://website2.domain.com/path/app.aspx?acctNum=$acctNum&acctType=LOAN&type=Documents"
	}
}

Thanks for the help!!

CA_Valli's avatar
CA_Valli
Icon for MVP rankMVP
Nov 23, 2022

I was capturing the full query parameter and skipping the first 13 characters (param name + "=" character) in order just to keep the value. 

Be careful with you syntax, because if another parameter is passed in querystring before acctNum value (like that LOAN that triggers the if condition) it might be captured instead. If param name is dynamic (eg. numbers change), you could also capture a "static" part and skip the dynamic pattern using an appropirate syntax. 

[findstr [HTTP::query] "KT1112" 13 &] will match all of the following param names, and save the param value after the "=" and up to first "&" character:  

KT1112_0_0_0=

KT1112_1_2_3=

KT1112aaaaaa=

I really think you should configure the match to be as close as possible. 

Regards

CA