nl_tokens: Makes a GET request without any data to see if the chunk has already been uploaded in a previous session
pl_tokens: function ( ) { // Set up request and listen for event this . xhr = new XMLHttpRequest ( ) ; this . xhr . addEventListener ( "load" , this . testHandler , false ) ; this . xhr . addEventListener ( "error" , this . testHandler , false ) ; var testMethod = evalOpts ( this . flowObj . opts . testMethod , this . fileObj , this ) ; var <mask> = this . prepareXhrRequest ( testMethod , true ) ; this . xhr . send ( data ) ; }