main.go

package main

import (
        "crypto/tls"
        "fmt"
        "context"
        "gopkg.in/resty.v1"
        "golang.org/x/oauth2"
)

func main() {
        conf := &oauth2.Config{}
        token := &oauth2.Token{
                AccessToken: "access token here",
                TokenType:   "bearer",
        }
        client := conf.Client(context.Background(), token)
        rc := resty.NewWithClient(client)

        rc.SetDebug(true)
        rc.SetTLSClientConfig(&tls.Config{InsecureSkipVerify: true})

        resp, err := rc.R().Get("https://untrusted-root.badssl.com/")
        if err != nil {
                fmt.Println("ERROR: " + err.Error())
        } else {
                fmt.Println("Response: " + resp.String())
        }

}