Facebook oAuth 400错误来自ASP.NET应用

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Net.WebException: The remote server returned an error: (400) Bad Request.

Source Error:

Line 231:        {
Line 232:                        
Line 233:            webRequest.GetResponse().GetResponseStream().Close();           
Line 234:            
Line 235:            responseReader.Close();