restTemplate.postForLocation returns null

I have wrote following code:

        MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
        map.add("secret", "SECRET_GOOGLE_KEY");
        map.add("response", recapchaResponse);
        restTemplate.postForLocation("http://ift.tt/1AMIfbj", map, ReCaptchaResponse.class);

last row returns null.

But when I send following response using POstman - I always see result:

What do I wrong?

P.S.

class ReCaptchaResponse{
    private String succes;
    private String [] errorCodes;

    public String[] getErrorCodes() {
        return errorCodes;
    }

    public void setErrorCodes(String[] errorCodes) {
        this.errorCodes = errorCodes;
    }

    public String getSucces() {
        return succes;
    }

    public void setSucces(String succes) {
        this.succes = succes;
    }
}