func (resp *Response) Ok() bool {
	return resp.OK()
}
Ok check Response StatusCode < 400 ?
package request
import (
	"compress/gzip"
	"compress/zlib"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"github.com/bitly/go-simplejson"
)
type Response struct {
	*http.Response
	content []byte
}
func (resp *Response) Json() (*simplejson.Json, error) {
	b, err := resp.Content()
	if err != nil {
		return nil, err
	}
	return simplejson.NewJson(b)
}
func (resp *Response) Content() (b []byte, err error) {
	if resp.content != nil {
		return resp.content, nil
	}
	var reader io.ReadCloser
	switch resp.Header.Get("Content-Encoding") {
	case "gzip":
		if reader, err = gzip.NewReader(resp.Body); err != nil {
			return nil, err
		}
	case "deflate":
		if reader, err = zlib.NewReader(resp.Body); err != nil {
			return nil, err
		}
	default:
		reader = resp.Body
	}
	defer reader.Close()
	if b, err = ioutil.ReadAll(reader); err != nil {
		return nil, err
	}
	resp.content = b
	return b, err
}
func (resp *Response) Text() (string, error) {
	b, err := resp.Content()
	s := string(b)
	return s, err
}
func (resp *Response) OK() bool {
	return resp.StatusCode < 400
}