// checkHTTPStatus examines an HTTP response and returns an error if
// it is not successful.
func checkHTTPStatus(resp *http.Response) error {
if len(resp.Status) > 0 && resp.Status[0] == '2' {
return nil
}
// Always collect the entire body; we will need it as a fallback
// and can only parse it once.
var body []byte
var err error
if resp.Body != nil {
body, err = ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
}
// Take a shot at decoding it as a better error
var errResp restdata.ErrorResponse
contentType := resp.Header.Get("Content-Type")
err2 := restdata.Decode(contentType, bytes.NewReader(body), &errResp)
if err2 == nil {
// Given that we decoded that successfully, return the
// server-provided error
return errResp.ToError()
}
return ErrorHTTP{Response: resp, Body: string(body)}
}
