Workable links through Nodemailer from my GitHub codespace? The email is sent but when clicking the link, the page comes up blank

Question

Using GitHub and need to send users to an html page but when users click on link, no content is shown. This is my code

The link is -> My GitHub link + hostName + ":8080/page.html" The hostName is : var hostName = require('os').hostname();

Any idea why this doesn't work?