Update debug code to not use Startup /2

Author: Rick-Anderson

aspnetcore/test/troubleshoot.md

@@ -83,6 +83,86 @@ To obtain the environment, use either of the following approaches:
 
 * Assign the environment to a property in `Program.cs`. Check the environment using the property, for example, `if (app.Environment.IsDevelopment())`.
 
+
+```csharp
+public void Configure(IApplicationBuilder app, IHostingEnvironment env, 
+    IConfiguration config)
+{
+    if (env.IsDevelopment())
+    {
+        app.Run(async (context) =>
+        {
+                   var sb = new StringBuilder();
+        var nl = System.Environment.NewLine;
+        var rule = string.Concat(nl, new string('-', 40), nl);
+
+
+        var authSchemeProvider = app.Services.GetRequiredService<IAuthenticationSchemeProvider>();
+
+        sb.Append($"Request{rule}");
+        sb.Append($"{DateTimeOffset.Now}{nl}");
+        sb.Append($"{context.Request.Method} {context.Request.Path}{nl}");
+        sb.Append($"Scheme: {context.Request.Scheme}{nl}");
+        sb.Append($"Host: {context.Request.Headers["Host"]}{nl}");
+        sb.Append($"PathBase: {context.Request.PathBase.Value}{nl}");
+        sb.Append($"Path: {context.Request.Path.Value}{nl}");
+        sb.Append($"Query: {context.Request.QueryString.Value}{nl}{nl}");
+
+        sb.Append($"Connection{rule}");
+        sb.Append($"RemoteIp: {context.Connection.RemoteIpAddress}{nl}");
+        sb.Append($"RemotePort: {context.Connection.RemotePort}{nl}");
+        sb.Append($"LocalIp: {context.Connection.LocalIpAddress}{nl}");
+        sb.Append($"LocalPort: {context.Connection.LocalPort}{nl}");
+        sb.Append($"ClientCert: {context.Connection.ClientCertificate}{nl}{nl}");
+
+        sb.Append($"Identity{rule}");
+        sb.Append($"User: {context.User.Identity.Name}{nl}");
+        var scheme = await authSchemeProvider
+            .GetSchemeAsync(IISDefaults.AuthenticationScheme);
+        sb.Append($"DisplayName: {scheme?.DisplayName}{nl}{nl}");
+
+        sb.Append($"Headers{rule}");
+        foreach (var header in context.Request.Headers)
+        {
+            sb.Append($"{header.Key}: {header.Value}{nl}");
+        }
+        sb.Append(nl);
+
+        sb.Append($"WebSockets{rule}");
+        if (context.Features.Get<IHttpUpgradeFeature>() != null)
+        {
+            sb.Append($"Status: Enabled{nl}{nl}");
+        }
+        else
+        {
+            sb.Append($"Status: Disabled{nl}{nl}");
+        }
+
+        sb.Append($"Configuration{rule}");
+        var config = builder.Configuration;
+
+         foreach (var pair in config.AsEnumerable())
+        {
+            sb.Append($"{pair.Key}: {pair.Value}{nl}"); 
+        }
+        sb.Append(nl);
+        sb.Append(nl);
+
+        sb.Append($"Environment Variables{rule}");
+        var vars = System.Environment.GetEnvironmentVariables();
+        foreach (var key in vars.Keys.Cast<string>().OrderBy(key => key,
+            StringComparer.OrdinalIgnoreCase))
+        {
+            var value = vars[key];
+            sb.Append($"{key}: {value}{nl}");
+        }
+
+        context.Response.ContentType = "text/plain";
+        await context.Response.WriteAsync(sb.ToString());
+    });
+}
+```
+
 :::code language="csharp" source="~/test/troubleshoot/code/9.x/Program.cs" highlight="13-85":::
 
 ## Debug ASP.NET Core apps