Plain HTTP is unencrypted and human-readable. This means that if a malicious actor was to eavesdrop on your connection, they would be able to see all of your data flowing back and forth.
You should use HTTPS, which is HTTP over an encrypted (TLS) connection, meaning eavesdroppers cannot read your traffic.
Your inbound traffic is not protected
Switch to HTTPS to benefit from TLS security features
The following example will fail the digitalocean-loadbalancing-enforce-https check.
The following example will pass the digitalocean-loadbalancing-enforce-https check.