Script mediator is helpful in many ways and it can be written in different scripting languages such as JavaScript, Groovy and Ruby. I'm going t o use JavaScript for this example. I'm trying to show you the way that you can use to log some values when you are writing a mediator. This will be helpful when you need to log values when you are writing a complex script mediators. This is a sample script <script language= "js" > var log = mc.getServiceLog(); log.info( "started" ); var temp_auth = mc.getProperty('authheader'); log.info( "temp_auth : " + temp_auth); log.info( "out" ); </script> When you define a " var log = mc.getServiceLog();" variable, you can use log object to display values as below. log.info( "started" ); log.info( "temp_auth : " + temp_auth); This is a sample proxy service <?xml version= "1.0" encod