问题
I have created a new ASP.net 5 MVC6 project and added the following:
app.UseStatusCodePages();
inside my configure method. If I run the application, open my web browser and navigate to the following URL:
http://localhost:34741/invalidroute
I am presented with a: Status Code: 404; Not Found error. This is expected, however if I make the route more complicated for example:
http://localhost:34741/this/is/a/complicated/route/this/is/a/complicated/route/this/is/a/complicated/route/this/is/a/complicated/route/this/is/a/complicated/route/this/is/a/complicated/route/this/is/a/complicated/route/
I am presented with a HTTP Error 404.20 - Not Found IIS Detailed Error page. Why is this no longer being handled by asp?
I have tried playing around with httpErrors in my web.config file and I have also tried setting a default document in IIS but I can't get a custom error page working :(
回答1:
https://support.microsoft.com/en-us/kb/943891
404.20 comes from IIS. There is a setting "maxurlSegments" to control how many segments are allowed, which you can find in
https://www.iis.net/configreference/system.applicationhost/sites/site/limits
Modify that IIS setting and the error should go away.
来源：https://stackoverflow.com/questions/35126535/404-20-exception-not-being-caught-by-asp-net-core