我遵循此文档提出令牌请求https://developers.google.com/identity/protocols/OAuth2InstalledApp
第一步，它工作正常。我可以获得验证码。在第二步中，我遇到了400错误请求的问题。我已经为这个问题找到答案了2天，但是我无法解决问题。我将所有属性都设置为文档，但是没关系：
POST /oauth2/v3/token HTTP/1.1
Host: www.googleapis.com
Content-Type: application/x-www-form-urlencoded
code=4/v6xr77ewYqhvHSyW6UJ1w7jKwAzu&
client_id=8819981768.apps.googleusercontent.com&
client_secret=your_client_secret&
redirect_uri=https://oauth2-login-demo.appspot.com/code&
grant_type=authorization_code
这是我的代码：
postData.Clear()
' code is the authentication code in the first request
postData.Add("code=" + code)
postData.Add("client_id=###############.apps.googleusercontent.com")
postData.Add("client_secrect=####################")
postData.Add("redirect_uri=urn:ietf:wg:oauth:2.0:oob")
postData.Add("grant_type=authorization_code")
Dim data As String = String.Join("&", postData.ToArray())
Dim request As HttpWebRequest = HttpWebRequest.Create("https://www.googleapis.com/oauth2/v3/token")
Dim byteData() As Byte = Encoding.UTF8.GetBytes(data)
request.Host = "www.googleapis.com"
request.Method = WebRequestMethods.Http.Post
request.ProtocolVersion = HttpVersion.Version11
request.ContentType = "application/x-www-form-urlencoded"
request.ContentLength = byteData.Length
Dim dataStream As Stream = request.GetRequestStream()
dataStream.Write(byteData, 0, byteData.Length)
dataStream.Close()
Dim response As HttpWebResponse = request.GetResponse()
Dim reader As Stream = response.GetResponseStream()
response.Close()
感谢您的回答！
我刚刚发现了一个错误。这是一个愚蠢的错误。我输入了client_secret的client_secrect接口。我无法相信我花了2天的时间来解决此错误。
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