Q: Why do feed endpoints now need to be HTTPS?
A:When Alexa communicates with your web service, user requests and corresponding responses are transmitted over the internet. To protect the confidentiality and integrity of this data, Alexa strictly enforces that HTTP connections are secured using SSL/TLS. To do so, you will need to update your content-hosting services with SSL Certificates.
You can find more information on SSL Certificates here: https://www.sslshopper.com/ssl-faq.html.
Q: Which type of SSL Certificates are supported?
A: You can learn more about the SSL certificate options supported by Alexa here.
Additionally, as web server configurations may vary, many content-hosting services provide support to move from HTTP endpoints to HTTPS. It may be beneficial to reach out to your content-hosting service for support with this process. For example, you could host your files at a service such as Amazon Simple Storage Service (Amazon S3), an Amazon Web Services offering.