hapi.js Cors Pre-flight不返回Access-Control-Allow-Origin标头

I have an ajax file upload using (Dropzone js). which sends a file to my hapi server. I realised the browser sends a PREFLIGHT OPTIONS METHOD. but my hapi server seems not to send the right response headers so i am getting errors on chrome. here is the error i get on chromeI have an ajax file upload using (Dropzone js).