Developer Exception Page is blank if added to IApplicationBuilder after MVC

[nsamteladze]

Developer Exception Page (app.UseDeveloperExceptionPage()) is blank if added to IApplicationBuilder after MVC (app.UseMvc()) in Startup.cs Configure method.

Developer Exception Page works fine if added before MVC.

Is this behavior intentional?

• Visual Studio Code 0.10.6 on Mac
• Microsoft.AspNet.Diagnostics 1.0.0-rc1-final
• Microsoft.AspNet.Mvc 6.0.0-rc1-final
• DNX Mono 1.0.0-rc1-update1

[davidfowl]

Yes, middleware is an ordered pipeline. If you put it after Mvc it won't be able to see errors that get thrown from MVC. Read more here https://docs.asp.net/en/latest/fundamentals/middleware.html

[nsamteladze]

@davidfowl Got it. Thanks. Closing the issue.