Forum Discussion

Jeff_Goot_42327's avatar
Jeff_Goot_42327
Icon for Nimbostratus rankNimbostratus
Apr 26, 2012

STREAM::expression Not Replacing All Occurrences

I'm trying to track down an issue with an iRule that uses STREAM::expression. It's able to replace the occurrences of the string, but not all of the occurrences.     Here's ...
application delivery
dev
devops
iRules
hoolio's avatar
hoolio
Icon for Cirrostratus rankCirrostratus
Jan 07, 2013
Hi Ken,

Is the server sending a chunked or compressed response? Those are two reasons that the stream filter might not match (assuming the stream filter is set correctly).

You can prevent chunking by setting the proxied request to HTTP 1.0 in HTTP_REQUEST:

https://devcentral.f5.com/wiki/iRules.CreditCardScrubberUsingStream.ashx 


       Don't allow response data to be chunked
      if { [HTTP::version] eq "1.1" } {
          if { [HTTP::header is_keepalive] } {
             HTTP::header replace "Connection" "Keep-Alive"
          }
          HTTP::version "1.0"
       }

And to prevent compression, you can remove the Accept-Encoding header from the proxied request in HTTP_REQUEST.

HTTP::header remove Accept-Encoding

Aaron