iRule to alter streamed response screwing up!

We use our F5 throughout all our environments, dev, qa and live (and beta). We have an iRule in place (as shown below) which is meant to find all occurances of www.blah.com and change it to qa1.blah.com. Additionally, if we have a content-type response that is text in some way, we essentially inject some js includes by replacing the "end body" tag with the js includes and then the "end body" tag.

 

 

It works pretty well, however we started noticing that it would inject the js includes into WebResource.AXD responses if that AXD file (which is just another js file) contained an "end body" tag somewhere. This is even though the AXD file is of content type application/x-javascript. From logging, we also noticed that for the AXD file request, we never get into the second "IF statement" in the HTTP_RESPONSE event.

 

 

So... how can this be!!!!

 

 

Russell McGinnis

 

 

when HTTP_REQUEST {

 

Save the URI so we can check it in the response

 

set uri [string tolower [HTTP::uri]]

 

set host [string tolower [HTTP::host]]

 

set repl "qa1"

 

}

 

 

when HTTP_RESPONSE {

 

if { [HTTP::status] eq "200" } {

 

Use a stream expression to replace content within the stream

 

IF... we are dealing with text content THEN

 

 

if {[HTTP::header value Content-Type] contains "text"} {

 

set stream_expression "@www.blah.com@$repl.blah.com@"

 

set stream_find ""

 

set stream_find_lower [string tolower $stream_find]

 

set stream_repl ""

 

set stream_repl_google_include "http://www.google-analytics.com/ga.js"

 

 

set InjectScript 1

 

log local0.debug "checking $uri"

 

switch -glob $uri {

 

"*.ashx*" -

 

"*.asmx*" -

 

"*.axd*" -

 

"*.js*" -

 

"*/player/html" {

 

set InjectScript 0

 

}

 

}

 

if { [TCP::server_port] == 443 }{

 

set InjectScript 0

 

set stream_repl_google_include "https://ssl.google-analytics.com/ga.js"

 

}

 

if { [HTTP::payload] contains "META HTTP-EQUIV=\"Refresh\""} {

 

set InjectScript 0

 

}

 

 

if {$InjectScript == 1} {

 

set include_js "infobarhandler.ashx"

 

 

append stream_repl ""

 

}

 

 

Google analytics for all text pages

 

append stream_repl ""

 

 

append stream_expression " @$stream_find@$stream_repl$stream_find@"

 

append stream_expression " @$stream_find_lower@$stream_repl$stream_find_lower@"

 

 

STREAM::disable

 

STREAM::expression $stream_expression

 

STREAM::enable

 

}

 

}

 

}