https://jonathanmh.com/tracing-preventing-http-redirects-golang/

app.go

package main

import (
	"fmt"
	"net/http"
)

func main() {
	myURL := "http://www.jonathanmh.com"
	nextURL := myURL
	var i int
	client := &http.Client{
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			return http.ErrUseLastResponse
		}}

	for i < 100 {

		resp, err := client.Get(nextURL)

		if err != nil {
			fmt.Println(err)
		}

		fmt.Println("StatusCode:", resp.StatusCode)
		fmt.Println(resp.Request.URL)

		if resp.StatusCode == 200 {
			fmt.Println("Done!")
			break
		} else {
			nextURL = resp.Header.Get("Location")
		}
	}
}

You never increment the counter. I'd suggest i += 1 along with the nextUrl reassignment (line 32)