These days, using secure connections via HTTPS (TLS) and the much more efficient HTTP/2 protocol should be a matter of course for all web applications. You can get a domain validated certificate from Let’s Encrypt at no cost to setup transport layer security (TLS). Also HTTP servers and web browsers widely adopted HTTP/2 already. Starting with Java 9 and Spring Boot 2 / Spring 5 you can easily enable web applications to use secure HTTPS/TLS connections and the HTTP/2 protocol.
As a developer most of the time you work in your local environment and cannot use any of the officially validated TLS certificates here. Instead, developers are using unsecured connections or self-signed certificates resulting in browser warnings. By setting up a private certificate authority (CA) you will be able to use secured connections without these annoying browser warnings.
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