How to Set Up HTTPS in Go Web Server With Multiple Certificate Files?

Enabling HTTPS in Go Web Server with SSL Certificate Files

When configuring HTTPS for a Go web server, you'll often encounter a scenario where you possess multiple certificate files distributed across different formats. This guide addresses this situation by explaining how to set up HTTPS using the files you've acquired from your provider.

Concatenating PEM Files

The first step is to concatenate three specific .pem files, namely the website.com.crt, website.com.ca-bundle, and private-key.pem. This process is necessary because Go requires a single certificate file and a private key file.

Generating a Single Certificate File

To concatenate the .pem files, use the following command:

cat website.com.crt website.com.ca-bundle > full-cert.crt

Setting Up HTTPS with Golang

Once you have the concatenated certificate file (full-cert.crt) and the private key file (private-key.pem), you can configure HTTPS for your Go web server. Utilize the http.ListenAndServeTLS() function as follows:

http.HandleFunc("/", handler)
log.Printf("About to listen on 10443. Go to https://127.0.0.1:10443/")
err := http.ListenAndServeTLS(":10443", "full-cert.crt", "private-key.key", nil)
log.Fatal(err)

Additional Considerations

• Ensure that the certificate and private key files are in the correct format and contain the appropriate information.
• The intermediate certificates are required because only root certificates are stored on devices.
• To combine the certificates, use the cat command to concatenate them into a single file.

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