Go http NewRequest POST gist

func (c *Client) GetChat(r *Request) (*Response, error) {
	jsonData, err := json.Marshal(r)
	if err != nil {
		return nil, err
	}

	req, err := http.NewRequest("POST", c.url, bytes.NewBuffer(jsonData))
	if err != nil {
		return nil, err
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+c.apiKey)

	client := &http.Client{}
	httpResp, err := client.Do(req)

	if err != nil {
		return nil, err
	}
	defer func() {
		_ = httpResp.Body.Close()
	}()

	var resp Response
	err = json.NewDecoder(httpResp.Body).Decode(&resp)
	if err != nil {
		return nil, err
	}

	return &resp, nil
}