Concatenating PEM Certificates for HTTPS in Go Web Server
When setting up HTTPS for a Go web server, you often encounter a need to concatenate multiple PEM certificate files. This process is essential to create a complete certificate chain that includes both your primary certificate and intermediate certificates.
Obtaining Intermediate Certificates
Typically, you will be provided with a bundle of PEM files when you purchase an SSL certificate, including:
Concatenating the Certificates
As per the documentation at https://www.kaihag.com/https-and-go/, you need to concatenate the following PEM files:
To do this, you can use the following command (assuming the files are in the current directory):
cat website.com.ca-bundle website.com.crt > full-cert.crt
This creates a combined certificate file named full-cert.crt, which contains both the intermediate certificates and your primary certificate.
Setting Up HTTPS in Go
Once you have a concatenated certificate file, you can use the http.ListenAndServeTLS function to start your HTTPS server in Go. Here's an example code snippet:
package main import ( "log" "net/http" ) func handler(w http.ResponseWriter, r *http.Request) { w.Write([]byte("Hello, HTTPS!")) } func main() { log.Printf("About to listen on 10443. Go to https://127.0.0.1:10443/") err := http.ListenAndServeTLS(":10443", "full-cert.crt", "private-key.pem", nil) log.Fatal(err) }
Replace full-cert.crt with the name of your concatenated certificate file and private-key.pem with the name of your private key file. Run the program and access https://127.0.0.1:10443/ to confirm that HTTPS is working correctly.
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