asp.net – 包装StaticFileMiddleware以重定向404错误

我正在尝试将自定义中间件注入我的OWIN管道,该管道包装了MS提供的StaticFileMiddleware,以支持AngularJS中的 HTML 5模式.我一直在关注这个指南： http://geekswithblogs.net/shaunxu/archive/2014/06/10/host-angularjs-html5mode-in-asp.net-vnext.aspx

从我可以收集到的如何工作,我的中间件将请求传递给静态文件中间件,然后如果它无法解决这些请求(即,请求HTML 5角度路径,“/无论如何“),它返回基本角度页面,以便HTML 5路径的硬请求将起作用.

我的问题是,调用内部中间件的结果似乎总是200状态代码,即使在我的浏览器中我得到404,这让我挠头.这是我的代码供参考：

public static class AngularServerExtension
{
    public static IAppBuilder UseAngularServer(this IAppBuilder builder,string rootPath,string entryPath)
    {
        var options = new AngularServerOptions()
        {
            FileServerOptions = new FileServerOptions()
            {
                EnableDirectoryBrowsing = false,FileSystem = new PhysicalFileSystem(System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory,rootPath))
            },EntryPath = new PathString(entryPath)
        };

        builder.UseDefaultFiles(options.FileServerOptions.DefaultFilesOptions);
        return builder.Use(new Func<AppFunc,AppFunc>(next => new AngularServerMiddleware(next,options).Invoke));           
    }
}

public class AngularServerMiddleware
{
    private readonly AngularServerOptions _options;
    private readonly AppFunc _next;
    private readonly StaticFileMiddleware _innerMiddleware;

    public AngularServerMiddleware(AppFunc next,AngularServerOptions options)
    {
        _next = next;
        _options = options;

        _innerMiddleware = new StaticFileMiddleware(_next,options.FileServerOptions.StaticFileOptions);
    }

    public async Task Invoke(IDictionary<string,object> environment)
    {
        IOwinContext context = new OwinContext(environment);
        // try to resolve the request with default static file middleware
        await _innerMiddleware.Invoke(environment);
        Debug.WriteLine(context.Request.Path + ": " + context.Response.StatusCode);
        // *** Right here is where I would expect a 404 but I get a 200 when debugging,// even though my browser eventually returns a 404

        // route to root path if the status code is 404
        // and need support angular html5mode
        if (context.Response.StatusCode == 404 && _options.Html5Mode)
        {
            context.Request.Path = _options.EntryPath;
            await _innerMiddleware.Invoke(environment);
            Console.WriteLine(">> " + context.Request.Path + ": " + context.Response.StatusCode);
        }
    }
}
public class AngularServerOptions
{
    public FileServerOptions FileServerOptions { get; set; }

    public PathString EntryPath { get; set; }

    public bool Html5Mode
    {
        get
        {
            return EntryPath.HasValue;
        }
    }

    public AngularServerOptions()
    {
        FileServerOptions = new FileServerOptions();
        EntryPath = PathString.Empty;
    }
}

<system.webServer>

<rewrite>
  <rules>
    <!--Redirect selected traffic to index -->
    <rule name="Index Rule" stopProcessing="true">
      <match url=".*" />
      <conditions logicalGrouping="MatchAll">
        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /> 
        <add input="{REQUEST_URI}" matchType="Pattern" pattern="^/api/" negate="true" />
      </conditions>
      <action type="Rewrite" url="/index.html" />
    </rule>
  </rules>
</rewrite>
...
</system.webServer>

<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />

<add input="{REQUEST_URI}" matchType="Pattern" pattern="^/api/" negate="true" />