Gzip compression levels

it is a strange error message since based on the WIKI you should be allow to use it within HTTP_REQUEST... maybe you are not authorized and can only do it in the response

if this is the case you can do something like this:

 
 when CLIENT_ACCEPTED { 
    set increase_compress 0 
 } 
  when HTTP_REQUEST {  
     if {[HTTP::path] ends_with ".aspx"} {  
           set increase_compress 1 
      } else { 
          set increase_compress 0 
      } 
  }  
  
 when HTTP_RESPONSE { 
    if {$increase_compress equals "1"} { 
           COMPRESS::gzip level 5  
    } 
 }