开发使用Google账户登录功能的坑

说明：使用netcore 框架开发时会遇到这个问题，其他语言的不会存在这个类型的错误，其他语言请移步

项目是基于net7进行开发，在使用google的“一键登录”功能时前面进行的很顺利，触发登录功能后能跳转到google 的登录授权页面，并进行授权。

问题出在授权完毕后，跳转到回调页面。页面报告如下错误

An unhandled exception occurred while processing the request.
TaskCanceledException: A task was canceled.

System.Threading.Tasks.TaskCompletionSourceWithCancellation<T>.WaitWithCancellationAsync(CancellationToken cancellationToken)

TimeoutException: A task was canceled.

System.Threading.Tasks.TaskCompletionSourceWithCancellation<T>.WaitWithCancellationAsync(CancellationToken cancellationToken)

TaskCanceledException: The request was canceled due to the configured HttpClient.Timeout of 60 seconds elapsing.

System.Net.Http.HttpClient.HandleFailure(Exception e, bool telemetryStarted, HttpResponseMessage response, CancellationTokenSource cts, CancellationToken cancellationToken, CancellationTokenSource pendingRequestsCts)

Exception: An error was encountered while handling the remote login.

Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler<TOptions>.HandleRequestAsync()

在这个错误出现后各种百度和Google搜索，Google文档翻来覆去的看。结果百思不得骑姐。

最后无奈扒拉相关的源代码。根据堆栈返回内容找到问题所在方法：Microsoft.AspNetCore.Authentication.OAuth.OAuthHandler<TOptions>.ExchangeCodeAsync

TaskCanceledException: The request was canceled due to the configured HttpClient.Timeout of 60 seconds elapsing.
System.Net.Http.HttpClient.HandleFailure(Exception e, bool telemetryStarted, HttpResponseMessage response, CancellationTokenSource cts, CancellationToken cancellationToken, CancellationTokenSource pendingRequestsCts)
System.Net.Http.HttpClient.<SendAsync>g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, bool disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)
Microsoft.AspNetCore.Authentication.OAuth.OAuthHandler<TOptions>.ExchangeCodeAsync(OAuthCodeExchangeContext context)
Microsoft.AspNetCore.Authentication.OAuth.OAuthHandler<TOptions>.HandleRemoteAuthenticateAsync()
Microsoft.AspNetCore.Authentication.RemoteAuthenticationHandler<TOptions>.HandleRequestAsync()

找到源码中的这句（看图中红色画线）

很显然，这个http请求任务出了问题。TokenEndpoint 这个地址没有请求到。可是我把它放到浏览器明明可以访问。没错，它时Google 的api 终结点。当我再次徜徉在google的搜索海洋中的时候，突然灵光一闪：mmp的我浏览器开了代理，但是系统没有开代理。所以在我打开了操作系统vpn后这个错误果然消失了。

总结：mmp