Application Insights and failed request response codes

Question

When an exception is unhandled in our web API, a response code 500 (Internal Server Error) will return to the client.

Although Application Insights doesn't record this as a 500, but rather a 200. Successful request is false, but the response code is still wrong.

How can I get the corrrect response codes in my telemetry?

Startup's Configure:

public void Configure(IApplicationBuilder app, IHostingEnvironment environment)
{
    if (!TelemetryConfiguration.Active.DisableTelemetry)
    {
        // Add Application Insights to the beginning of the request pipeline to track HTTP request telemetry.
        app.UseApplicationInsightsRequestTelemetry();

        // Add Application Insights exceptions handling to the request pipeline. Should be
        // configured after all error handling middleware in the request pipeline.
        app.UseApplicationInsightsExceptionTelemetry();
    }

    app.UseRequireHttps(environment.IsLocal());
    app.UseMiddleware<NoCacheMiddleware>();
    app.UseJwtBearerAuthentication(...);
    app.UseCors("CorsPolicy");
    app.UseStaticFiles();
    app.UseCompression();
    app.UseMvc();
}

Solution

Although Application Insights doesn't record this as a 500, but rather a 200. Successful request is false, but the response code is still wrong.

As far as I know, if application has no error handling middleware Application Insights will report response status code 200 when unhandled exception is thrown. We could find detailed info from this article. I am using the following code in the method Configure and I could get the correct response status code.

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
    if (!Microsoft.ApplicationInsights.Extensibility.TelemetryConfiguration.Active.DisableTelemetry)
    {
       app.UseApplicationInsightsRequestTelemetry();

       app.UseApplicationInsightsExceptionTelemetry();
    }

    loggerFactory.AddConsole(Configuration.GetSection("Logging"));
    loggerFactory.AddDebug();

    app.UseIISPlatformHandler();
    app.UseExceptionHandler(options => {
        options.Run(
        async context =>
        {
            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
            context.Response.ContentType = "text/html";
            var ex = context.Features.Get<IExceptionHandlerFeature>();
            if (ex != null)
            {
                var err = $"<h1>Error: {ex.Error.Message}</h1>{ex.Error.StackTrace }";
                await context.Response.WriteAsync(err).ConfigureAwait(false);
            }
        });
    });

    app.UseStaticFiles();

    app.UseMvc();
}