.NET Core redirect to custom error pages from Startup.cs

Question

I have error 400 and 404 pages that I have created and want to use it for my application. I have declared this in my Startup.cs:

app.UseStatusCodePages(async context => {
    if(context.HttpContext.Response.StatusCode == 400)
    {
        context.HttpContext.Response.Redirect("~/Views/Shared/Errors/AccessDenied.cshtml");
    }
});
app.UseStatusCodePages(async context => {
    if (context.HttpContext.Response.StatusCode == 404)
    {
        context.HttpContext.Response.Redirect("~/Views/Shared/Errors/NotFound.cshtml");
    }
});

Is this correct? When I tested it, I still get redirected back to the standard .net core error page.Am I missing something else?

May be cause you are getting 500 Status code and not 400/404 — Rahul
– Rahul, Commented Jun 24, 2019 at 9:44
I'm getting a 404. The way I get it is from a link www.app.com/user/abcd1234 — JianYA
– JianYA, Commented Jun 24, 2019 at 9:50

Rahul · Accepted Answer · 2019-06-24 10:03:33Z

2

First of all, you can combine both using an if .. else construct like

app.UseStatusCodePages(async context => {
    if(context.HttpContext.Response.StatusCode == 400)
    {
        context.HttpContext.Response.Redirect("~/Views/Shared/Errors/AccessDenied.cshtml");
    }
    else if (context.HttpContext.Response.StatusCode == 404)
    {
        context.HttpContext.Response.Redirect("~/Views/Shared/Errors/NotFound.cshtml");
    }
});

Second, make sure you call UseStatusCodePages middleware before request handling middleware (for example, Static File Middleware and MVC Middleware).

I would suggest you to use either UseStatusCodePagesWithRedirect (OR) UseStatusCodePagesWithReExecute instead redirecting explicitly

answered Jun 24, 2019 at 10:03

Rahul

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1 Comment

JianYA Over a year ago

Hi! Thanks for your answer. However, I am getting this url now when the error 404 happens. localhost:44365/Messages/AnnouncementAttachments/~/Views/Shared/…

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