即使允许几乎所有内容，ASP.NET 5/Core/vNext CORS 也无法正常工作

问题描述

我有一个 ASP.NET 5 Web API(好吧，无论如何现在都是 MVC)后端，我正在使用

问题实际上在于处理 POST 请求的操作中存在异常，正如 Norgerman 所说，默认异常处理程序清除了 CORS 标头.

I have a ASP.NET 5 Web API (Well, MVC now anyway) back-end which I am consuming in with the axios library in my JS app.

My CORS config in MVC is the following:

public void ConfigureServices(IServiceCollection services)
{
      services.AddMvc();
      services.AddCors();
} 


public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{ 
      app.UseCors(builder => {
          builder.AllowAnyOrigin().AllowAnyMethod().AllowAnyHeader();
      });
}

So in other words, I should be allowing every request possible. However, while this fixed preflight requests, a POST requests still gets rejected (I can see it executes on the server, but there's no header in the response so it results in a client side error).

Does anyone have any ideas why this wouldn't work ?

These are the headers that are returned by the MVC api:

• For the OPTIONS preflight (this one passes):
• For the actual POST request (this one does NOT pass):

The problem was actually in the fact that there was an exception in the action processing the POST request and as Norgerman mentioned, the default exception handler cleared the CORS headers.

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