A website starts using HTTPS when its owner sets up an SSL/TLS certificate and configures the web server to use it. The browser then connects securely instead of sending the website’s data as plain HTTP.

First, the Website Needs a Certificate

The first step is getting an SSL/TLS certificate for the website’s domain. This certificate proves that the website controls that domain and gives the browser the information it needs to create a secure connection.

A certificate authority issues the certificate. Many website owners use a free certificate from Let’s Encrypt because there’s little reason to pay for a basic certificate these days.

The Domain Has to Be Verified

Before issuing the certificate, the certificate authority checks that the requester controls the domain. This usually happens through a DNS record or a file placed on the website.

Then HTTPS Gets Turned On

Having a certificate sitting on a server doesn’t automatically make the website secure. The server has to be configured to use it for HTTPS connections, normally through port 443.

The setup depends on the server software. Nginx has its own configuration. Apache has another approach. Hosting platforms often hide most of this behind a button, which is honestly how it should be for a basic website.

After the certificate is installed, someone usually checks that the HTTPS version loads correctly. Then HTTP traffic is redirected to HTTPS so visitors don’t keep landing on the old version.

• The certificate proves domain control, which is the first piece of the trust process.

• Port 443 is where HTTPS normally listens, though you don’t type the port into a normal web address.

• An HTTP redirect keeps old links working, which matters because people will keep using bookmarks you forgot existed.

The Browser Takes Over From There

When you visit an HTTPS page, the browser and server begin a TLS handshake. They agree on how the connection will be protected and establish encryption keys for the session.

After that, information moving between your browser and the website is encrypted. Someone snooping on the connection shouldn’t be able to simply read the contents.

You usually don’t notice any of this. And that’s the good part. Secure connections should feel boring.

There Are a Few Things to Check

• Mixed content is the annoying leftover bit, especially on older sites where nobody remembers who added that HTTP image years ago.

• Redirects matter more than they look. A missing redirect can leave visitors staring at an old HTTP page.

• Certificate renewal needs attention, because an expired certificate can make a perfectly good website look broken.