Now it's time to find out how to write secure web services in the Go language. Fortunately, Go was built from the grounds up with modern software architectures in mind, which includes secure web applications. Go comes with a powerful standard library that allows a smooth transition from HTTP servers to HTTPS servers. Before we start looking into the code, let's answer the simple question of how to obtain a digital certificate to use in our web server.
The default method to obtain a digital certificate for your organization, start-up, or website is to buy the service of verifying your identity and issuing a certificate from a certificate authority provider. As we mentioned earlier, there are multiple certificate authority providers. A list of the most popular providers can be found in Wikipedia at: https://en.wikipedia.org/wiki/Certificate_authority#Providers
There are also certificate authorities who provide the service for free. For example...