uri rewrite question

 
 when HTTP_RESPONSE { 
  
    STREAM::disable 
  
    if { [HTTP::header value Content-Type] contains "text" }{ 
       STREAM::expression {@&postDataBin=y\>@&postDataBin=y\@} 
       STREAM::enable 
    } 
 } 
  
  This section only logs matches, and should be removed before using the rule in production. 
 when STREAM_MATCHED { 
    log local0. "Matched: [STREAM::match]" 
 }