providers/logingov.go [201:227]:
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	var req *http.Request
	req, err = http.NewRequest("POST", p.RedeemURL.String(), bytes.NewBufferString(params.Encode()))
	if err != nil {
		return
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	var resp *http.Response
	resp, err = http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	var body []byte
	body, err = ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	if err != nil {
		return
	}

	if resp.StatusCode != 200 {
		err = fmt.Errorf("got %d from %q %s", resp.StatusCode, p.RedeemURL.String(), body)
		return
	}

	// Get the token from the body that we got from the token endpoint.
	var jsonResponse struct {
		AccessToken string `json:"access_token"`
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providers/provider_default.go [32:58]:
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	var req *http.Request
	req, err = http.NewRequest("POST", p.RedeemURL.String(), bytes.NewBufferString(params.Encode()))
	if err != nil {
		return
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	var resp *http.Response
	resp, err = http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	var body []byte
	body, err = ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	if err != nil {
		return
	}

	if resp.StatusCode != 200 {
		err = fmt.Errorf("got %d from %q %s", resp.StatusCode, p.RedeemURL.String(), body)
		return
	}

	// blindly try json and x-www-form-urlencoded
	var jsonResponse struct {
		AccessToken string `json:"access_token"`
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