Golang reverse proxy returns Not found or Forbidden Errors

func main() {
 r := gin.Default()

 eanAPI := api.NewEanAPI()

 routers.InitRedirectRoutes(r, eanAPI)
 port := os.Getenv("PORT")
 if len(port) == 0 {
  port = "8000"
 }
 r.Run(":" + port)
}

// InitRedirectRoutes initialize routes redirection.
func InitRedirectRoutes(r *gin.Engine, eanAPI api.EanAPI) {
 r.POST("/*action", eanAPI.ReverseProxy)
 r.GET("/*action", eanAPI.ReverseProxy)
}


type EanAPI interface {
 ReverseProxy(ctx *gin.Context)
}

type eanAPI struct {
 baseURL string
}

func NewEanAPI() EanAPI {
 return &eanAPI{}
}

func (api *eanAPI) ReverseProxy(ctx *gin.Context) {
    // proxy
    forwardToHost := "http://httpbin.org/"
    // I tried with "https://jsonplaceholder.typicode.com/" 
    "http://google.com"

 reverseProxy := proxy.NewProxy(forwardToHost)
 reverseProxy.Handle(ctx.Writer, ctx.Request, url.Parse(forwardToHost))
}

type Prox struct {
 target *url.URL
 proxy  *httputil.ReverseProxy
}

func NewProxy(target string) *Prox {
 url, _ := url.Parse(target)
 fmt.Println("url", url)
 return &Prox{target: url, proxy: httputil.NewSingleHostReverseProxy(url)}
}

func (p *Prox) Handle(w http.ResponseWriter, r *http.Request, origin *url.URL) {
 w.Header().Set("Content-Type", "application/json; charset=utf-8")
 w.Header().Set("X-Forwarded-Host", r.Host)
 w.Header().Set("X-Origin-Host", origin.Host)
 r.URL.Scheme = origin.Scheme
 r.URL.Host = origin.Host

 p.proxy.ServeHTTP(w, r)
}