我在Angular应用程序中也遇到了同样的问题.花了很多时间后，我发现问题与Node JS有关.我们使用的是Node JS v12.x.x，在此版本中，max-http-header-size从80KB减少到8KB.我拥有的auth令牌大约为10KB.这就是为什么当我重新加载应用程序时，浏览器开始为某些文件显示"431请求标头字段太大"错误.我已经更新了Node JS v14.x.x，它再次开始工作，因为在v14.0.0中，max-http-header-size已增加到16KB.

I had faced the same issue in my Angular Application. After spending a lot of time, I had found out that the issue is related with Node JS. We were using Node JS v12.x.x, and in this version, max-http-header-size reduced to 8KB from 80KB. And the auth token which I had was of around 10KB. That's why, when I reload the app, browser starts giving '431 request header fields too large' error for some of the files. I had updated the Node JS v14.x.x and it starts working again because in v14.0.0, max-http-header-size has been increased to 16KB.

希望这会有所帮助.