Stream Profile: Replace String

Hi Hamish,

Yes, STREAM::expression accepts variables. Just make sure to wrap the string in double quotes instead of curly braces.

Also, I think you'll need to save the HTTP::host value in HTTP_REQUEST. And it would be good to only enable the stream filter for text responses when the client used a host header.

http://devcentral.f5.com/Wiki/default.aspx/iRules/STREAM__expression.html

 
 when HTTP_REQUEST { 
     Save the host header value 
    set host [HTTP::host] 
 } 
 when HTTP_RESPONSE { 
  
     Disable the stream filter by default 
    STREAM::disable 
  
     Check if response type is text 
    if {[HTTP::header value Content-Type] contains "text" && $host ne ""}{ 
  
        Replace any instance of the requested with newhost.example.com 
       STREAM::expression "@$host@newhost.example.com@" 
  
        Enable the stream filter for this response only 
       STREAM::enable 
    } 
 } 
 

Aaron