I want to inject my HTML email template to email using node:

at my HTML code I import font like this:

<style type="text/css">
      
      @import url('${fontFolder}/IRANSansWeb_Light.woff');
      
      @font-face {
        font-family: "IRANSansWeb_Light";
        src: url(IRANSansWeb_Light.woff) format("truetype");
      }

...

I can download the font via the url (${fontFolder}/IRANSansWeb_Light.woff) in ethereal email which is a service for testing email but I get this error and unable to load the email:

Failed to load resource: the server responded with a status of 500 ()