C＃REST API使用承载令牌进行身份验证

Question

尝试编写一个工具，通过REST API从服务器下载.zip文件。 它的工作没有SOAP-UI的任何问题，但我的工具不想下载任何文件。

始终收到此错误：

  

无法使用此动词类型发送内容正文。

我的POST-Requests工作正常，但GET-Requests会产生问题。我认为我的Webrequest-Header存在问题。

身份验证必须如下所示：

  

承载“访问令牌”

这是我的代码：

class RestProvider
{
    protected string method;
    protected string endpoint;
    protected string resource;
    protected string parameters;


    public RestProvider(string method, string endpoint, string resource, string parameters)
    {
        this.method = method;
        this.endpoint = endpoint;
        this.resource = resource;
        this.parameters = parameters;
    }


    public string GetResponse()
    {
        string resultString = string.Empty;
        ASCIIEncoding enc = new ASCIIEncoding();
        byte[] paramData = enc.GetBytes(parameters);

        if (this.method == "post")
        {
            try
            {
                WebRequest request = WebRequest.Create(this.endpoint + this.resource);
                request.Method = this.method;
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = paramData.Length;

                Stream stream = request.GetRequestStream();
                stream.Write(paramData, 0, paramData.Length);
                stream.Close();

                WebResponse response = request.GetResponse();
                stream = response.GetResponseStream();

                StreamReader sr = new StreamReader(stream);
                resultString = sr.ReadToEnd();
                sr.Close();
                stream.Close();
            }

            catch(Exception ex)
            {
                resultString = "{\"errorMessages\":[\"" + ex.Message.ToString() + "\"],\"errors\":{}}";
            }
        }

        else if(this.method == "get")
        {
            try
            {
                WebRequest request = WebRequest.Create(this.endpoint + this.resource);
                request.Headers["Authorization"] = "Bearer " + Convert.ToBase64String(Encoding.Default.GetBytes(this.parameters));
                request.Method = this.method;
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = paramData.Length;

                Stream stream = request.GetRequestStream();
                stream.Write(paramData, 0, paramData.Length);
                stream.Close();

                WebResponse response = request.GetResponse();
                stream = response.GetResponseStream();

                StreamReader sr = new StreamReader(stream);
                resultString = sr.ReadToEnd();
                sr.Close();
                stream.Close();
            }

            catch (Exception ex)
            {
                resultString = "{\"errorMessages\":[\"" + ex.Message.ToString() + "\"],\"errors\":{}}";
            }
        }

        return resultString;       
    }
}

有什么想法吗？