How to set up HTTPS on golang web server?

You need http.ListenAndServeTLS

package main

import (
    // "fmt"
    // "io"
    "net/http"
    "log"
)

func HelloServer(w http.ResponseWriter, req *http.Request) {
    w.Header().Set("Content-Type", "text/plain")
    w.Write([]byte("This is an example server.\n"))
    // fmt.Fprintf(w, "This is an example server.\n")
    // io.WriteString(w, "This is an example server.\n")
}

func main() {
http.HandleFunc("/hello", HelloServer)
    err := http.ListenAndServeTLS(":443", "server.crt", "server.key", nil)
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

Here’s a snippet: https://gist.github.com/denji/12b3a568f092ab951456

Use https://golang.org/pkg/net/http/#ListenAndServeTLS

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)

For Go you need one certificate file (containing one or more certs, starting with yours) and one private key file (containing one private key).

This isn't really a go question, but the intermediate certs are required because computers only store root certs. By concatenating them you put them all in one file so the browser gets all certs - this is a required step otherwise your server will fail on certain devices. Your cert provider will provide instructions for doing this.

https://kb.wisc.edu/page.php?id=18923

To combine the certs you can just use cat (making sure they have a line feed at the end of the file first), something like:

cat example.com.ca-crt example.com.ca-bundle > example.com.crt