How to Set Up HTTPS for a Go Web Server Using a Comodo SSL Certificate?

How to Configure HTTPS for a Go Web Server

Problem:

You have obtained an SSL certificate from Comodo and received a .zip file containing the following files:

• csr.pem
• private-key.pem
• website.com.crt
• website.com.ca-bundle
• website.com.zip

However, you're unsure how to concatenate the necessary .pem files and set up HTTPS on your Go web server.

Solution:

1. Concatenating the Certificates

The .pem files need to be concatenated to create a single certificate file. This file will contain the root certificate, intermediate certificates (if any), and your SSL certificate. To concatenate the certificates, you can use the following command:

cat website.com.crt website.com.ca-bundle > certificate.pem

2. Setting Up HTTPS on a Go Web Server

Once you have the concatenated certificate file, you can configure HTTPS for your Go web server using the ListenAndServeTLS function:

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

Explanation:

For Go, you only need two files: a certificate file containing all necessary certificates and a private key file. By concatenating the certificates into one file, you provide the browser with all required certifications, ensuring that your server is accessible from all devices.

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