Question

Web.config :

<customErrors mode="On">
      <error statusCode="404" redirect="~/Page-Introuvable" />
  </customErrors>

Rewriter.config :

<rewriter>
    <rewrite url="~/Page-Introuvable" to="~/PageNotFound.aspx" />
</rewriter>

When typing this unexisting url :

http://example.com/qwerty.aspx

I get to see my error 404 custom page

When typing this :

http://example.com/qwerty (without .aspx)

I get server page 404 error

I’d like to know how to display my custom page in this case.

Thank you very much!

ANSWER

Added this to web.config section System.webServer :

<httpErrors errorMode="Custom">
      <clear/>
      <error statusCode="404" responseMode="Redirect" path="PageNotFound.aspx"/>
  </httpErrors>

Answer 1

<customErrors> are just for extensions handled by asp.net (aspx, ashx…), for all others use <httpErrors>: http://www.iis.net/ConfigReference/system.webServer/httpErrors

<system.webServer>
    <httpErrors errorMode="DetailedLocalOnly" defaultResponseMode="ExecuteURL" defaultPath="/error.aspx?code=404">
        <clear/>
        <error statusCode="404" responseMode="ExecuteURL" path="/error.aspx?code=404"/>
    </httpErrors>
</system.webServer>