Buy a SSL Certificate
Secure Sockets Layer (SSL) certificates, sometimes called digital certificates, are used to establish an encrypted connection between your computer and the web server. And it probably will also load faster, and it sometimes enables HTTP/2. Google may also think of SSL as more SEO friendly.
I am using one of these two SSL-vendors:
Install the SSL Certificate
Installing the certificate can be tricky. You can check that the certificate is correctly installed:
Upload the certificates to VPS at the same level as the Go executable
Add https support to Go by redirecting from http to https.