Service Account flow - 2 Legged Oauth Golang

[supreetd21]

I want to get the Oauth token from the GCP client credentials.
Reference

package main

import (
	"fmt"
	"io/ioutil"
	"log"

	"golang.org/x/oauth2"
	"golang.org/x/oauth2/google"
)

func main() {
	data, err := ioutil.ReadFile("/Users/supreetdeshpande/Downloads/esp-rainmaker-97663-2f539a842d10.json")
	if err != nil {
		log.Fatal(err)
	}
	conf, err := google.JWTConfigFromJSON(data, "https://www.googleapis.com/auth/homegraph")
	if err != nil {
		log.Fatal(err)
	}

	client := conf.Client(oauth2.NoContext)
	response, err := client.Get("...")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println(response)
}

I have downloaded the credentials and they work well with the Google Actions Test suite.
I tried this code but I'm getting 2020/06/02 01:58:56 Get ...: unsupported protocol scheme ""

Often these errors seem to arise due to incorrect token URLs. My configured URI is https://oauth2.googleapis.com/token which conforms as stated here.

Works well with oauth2l fetch --credentials ~/Downloads/esp-rainmaker-97663-2f539a842d10.json --scope https://www.googleapis.com/auth/homegraph

Is there something I could be missing on my part?

[supreetd21]

The above code is incorrect, for those confused with the service account example in Godoc.(https://pkg.go.dev/golang.org/x/oauth2/google?tab=doc#example-package-ServiceAccount)
Here's the solution - #280