simple stream replace not working

If you are going to use a Stream Profile in an iRule you need several things.

1. A Blank Stream Profile (create a stream profile, name it, and save it with the options empty)

profile stream blank.stream.profile {
   defaults from stream
}

2. An HTTP Profile (Suggest building a Custom Profile for using a Stream Profile with an iRule) that has "Response Chunking" set to "Rechunk"

3. The iRule. This is also the way that you can "Overload" a Stream Profile to do multiple replacements (You can do it to a normal stream profile as well, but you have to totally do it command line).

Base iRule:

when HTTP_RESPONSE {
    STREAM::disable 
    STREAM::expression "@Hello@45678@ @Goodbye@12345@"
    STREAM::enable
    }
}

Need an exception to the Stream Profile? It requires two parts. HTTP_REQUEST sets the variable for the HTTP_RESPONSE to use:

when HTTP_REQUEST {
    set uri [HTTP::uri] 
}
when HTTP_RESPONSE {
    STREAM::disable 
    STREAM::expression "@Hello@45678@ @Goodbye@12345@"
    if { !($uri contains "somefile.xml") || !($uri contains "/some/folder/") } {
       STREAM::enable
    }
}