Redirecting to custom error pages in Azure Application service doesn't work

Question

I'm trying to redirect in case of an http error to a error page hosted in an external url making use of the element <httpErrors> in my web.config file in server. Currently I have the following configuration

<configuration>
  <system.webServer>
    <httpErrors errorMode="Custom" defaultResponseMode="Redirect">
      <error statusCode="404" path="https://my-custom-error-page.com" />
    </httpErrors>
  ...

and whatever I set as defaultResponseMode I cannot get the error page, and instead I'm still retrieving always the IIS error page.

someone knows what's missing?

---

• IIS version 8.5
• https://learn.microsoft.com/en-us/iis/configuration/system.webserver/httperrors/

Answer 1

Redirecting to custom error pages in Azure Application service doesn't work

• Make sure your web.config is deployed in the wwwroot directory
• Iam able to redirect to CustomError page with the below setting in web.config when an error occurs

<httpErrors existingResponse="PassThrough" />
   <httpErrors errorMode="Custom" defaultResponseMode="ExecuteURL">
      <remove statusCode="404" subStatusCode="-1" />
      <error statusCode="404" path="/public/404.html" responseMode="ExecuteURL" />
    </httpErrors>

• Under <system.webServer> , Make sure you add

<httpErrors existingResponse="PassThrough" />

• Check the path correctly
• Under wwwroot folder created one folder named public and added the error.html page. Give the same path /public/404.html in web.config
• Tried to access the page which does not exists, it redirected to the error page