Oauth2：远程服务器返回错误：(400) Bad Request

Question

我想在内部应用程序中实现 Google 的 Oauth2，并且正在使用 C# 控制台应用程序玩此处找到的演示：

https://code.google.com/p/google-gdata/source/browse/trunk/clients/cs/samples/oauth2_sample/oauth2demo.cs

我已将所有必要的 Google API 库添加到我的项目（核心客户端、YouTube、联系人……）并注册了我的应用程序……..

当我执行程序时，我可以从授权客户端取回访问代码等……我正在使用正确的客户端 ID、ClientSecret 密钥……。

我最终得到一个异常：远程服务器返回错误：(400) Bad Request。

从此方法抛出：

    public static void GetAccessToken(OAuth2Parameters parameters) {
      OAuthBase.GetOAuth2AccessToken(parameters, OAuthBase.GetExchangeAccessCodeRequestBody(parameters));
    }

调用者：

public static void GetOAuth2AccessToken(OAuth2Parameters parameters, String requestBody) { Uri requestUri = new Uri(parameters.TokenUri); WebRequest 请求 = WebRequest.Create(requestUri); request.Method = "POST";

        request.ContentType = "application/x-www-form-urlencoded";

        Stream outputStream = request.GetRequestStream();
        StreamWriter w = new StreamWriter(outputStream);
        w.Write(requestBody);
        w.Flush();
        w.Close();

        WebResponse response = request.GetResponse();
        string result = "";
        if (response != null) {
            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);
            result = reader.ReadToEnd();

            Dictionary<string, string> dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(result);

            if (dict.ContainsKey(OAuth2AccessToken)) {
              parameters.AccessToken = dict[OAuth2AccessToken];
            }
            if (dict.ContainsKey(OAuth2RefreshToken)) {
              parameters.RefreshToken = dict[OAuth2RefreshToken];
            }
            if (dict.ContainsKey(OAuth2TokenType)) {
              parameters.TokenType = dict[OAuth2TokenType];
            }
            if (dict.ContainsKey(OAuth2ExpiresIn)) {
              parameters.TokenExpiry = DateTime.Now.AddSeconds(int.Parse(dict[OAuth2ExpiresIn]));
            }
        }
    }

有人可以解释一下可能导致以下错误的原因吗？

System.Net.WebException was unhandled
  HResult=-2146233079
  Message=The remote server returned an error: (400) Bad Request.
  Source=System
  StackTrace:
       at System.Net.HttpWebRequest.GetResponse()
       at Google.GData.Client.OAuthBase.GetOAuth2AccessToken(OAuth2Parameters parameters, String requestBody) in c \Development\lib\YouTube\libgoogle-data-mono-2.1.0.0\src\core\oauthbase.cs:line 435
       at Google.GData.Client.OAuthUtil.GetAccessToken(OAuth2Parameters parameters) in c:\ \lib\YouTube\libgoogle-data-mono-2.1.0.0\src\core\oauthutil.cs:line 246
       at GoogleAppsConsoleApplication.OAuth2Demo.Main(String[] args) in c:\Users\test\Documents\Visual Studio 2012\Projects\GoogleAppsConsoleApplication\GoogleAppsConsoleApplication\Program.cs:line 60
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

Answer 1

您正在使用旧的 gdata 协议。我建议您使用Google APIs client library。 查看https://code.google.com/p/google-api-dotnet-client/wiki/OAuth2 了解如何使用 OAuth2 的详细信息。