Insert JavaScript If URL path contains word

you can try this code:

In your code, you don't server side http compression. and the stream expression variable is created on every response instead of create it only when the irule is loaded.

when RULE_INIT {
     Insert  Token Javascript
    set jscript {}
     Create the stream expression list and insert in this list all rewrite expressions.
    set static::stream_expression [list]
    lappend static::stream_expression "@@$jscript@"
    lappend static::stream_expression "@@$jscript@"
     create the extension list to not rewrite
    set static::no_rewrite_ext [list ashx asmx axd js]
}   

when HTTP_REQUEST { 
  Check if the word is included in URI and if request extension support javascript insertion.
    if {[HTTP::uri] contains "/Anakin" && [lsearch $static::no_rewrite_ext [getfield [URI::basename [HTTP::uri]] "." 2]] == -1 } { 
        set insertJscript 1
        HTTP::header remove "Accept-Encoding"
    } else { 
        set insertJscript 0 
    }
   Disable the stream filter for client requests as we are only interested in the server response 
    STREAM::disable 
} 

when HTTP_RESPONSE { 
    if {$insertJscript && [HTTP::status] == 200 && [HTTP::header value Content-Type] contains "text" && !([HTTP::payload] contains "META HTTP-EQUIV=\"Refresh\"")} { 
        STREAM::expression $static::stream_expression 
        STREAM::enable
    }
}