HTML image not showing in Gmail

Question

I\'m sending an e-mail newsletter in HTML. Inside the HTML I have something like

Answer 1

HTTP or HTTPS should be full address

background-image: url(http://fulladdress.com/ca/1/product_assets/T/C/X/M/K/NMTCXMK_mu.jpg)

var mailOptions = {
  from: 'fulladdress@gmail.com',
  to: emails,
  subject: 'i super another ma node mailer cool test',
  text: 'That was easy!',
  html: '
ascfas'
};