(400) 错误请求：获取 Salesforce 的 AccessToken

Question

我正在尝试通过我的应用程序中的 oauth 从 Salesforce 获取所有联系人。我在我的回调页面上尝试通过 API Token Url 获取 访问令牌 时收到 远程服务器返回错误：(400) Bad Request.。即使当我复制 URL 并直接粘贴到 URL 时，它也会给我正确的数据。但无法获取访问令牌。

我正在使用以下方法获取 访问令牌。请专家建议我在哪里做错了。同样的方法适用于 Google 和 LinkedIn。

public async Task<TokenResponse> GetAccessToken(string code,string tokenUrl,string consumerKey,string consumerSecretKey,string redirecturl)
    {

        string responseFromServer = "";
        var webRequest = WebRequest.Create(tokenUrl);

        const string queryStringFormat = @"code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type=authorization_code";
        string contents = string.Format(queryStringFormat
                                           , code
                                           , consumerKey
                                           , consumerSecretKey
                                           , redirecturl);

        webRequest.Method = "POST";
        byte[] postcontentsArray = Encoding.UTF8.GetBytes(contents);
        webRequest.ContentType = "application/x-www-form-urlencoded";
        webRequest.ContentLength = postcontentsArray.Length;
        using (Stream requestStream = webRequest.GetRequestStream())
        {
            requestStream.Write(postcontentsArray, 0, postcontentsArray.Length);
            requestStream.Close();
            WebResponse response = webRequest.GetResponse();
            using (Stream responseStream = response.GetResponseStream())
            {
                if (responseStream != null)
                {
                    using (StreamReader reader = new StreamReader(responseStream))
                    {
                        responseFromServer = reader.ReadToEnd();
                        reader.Close();
                        responseStream.Close();
                        response.Close();
                    }
                }
            }

        }
        return JsonConvert.DeserializeObject<TokenResponse>(responseFromServer);
    }

请帮我解决这个问题。

Answer 1

我正在毫无问题地连接到 Salesforce，但我使用的是 HttpClient 而不是 WebRequest。

            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

            HttpContent content = new FormUrlEncodedContent(new Dictionary<string, string>
            {
                {"grant_type", "password"},
                {"client_id", _clientId},
                {"client_secret", _clientSecret},
                {"username", _userName},
                {"password", _password}
            }
                );

                using (var httpClient = new HttpClient())
                {
                    var message =
                        await httpClient.PostAsync(_authorizationUrl, content).ConfigureAwait(false);
                    var responseString = await message.Content.ReadAsStringAsync().ConfigureAwait(false);

                    var obj = JObject.Parse(responseString);

                    var oauthToken = (string)obj["access_token"];
                    var serviceUrl = (string)obj["instance_url"];
}