[JENKINS-62890] Custom Error Handler to not display default jetty error page

[jenkins-infra-bot]

Currently a 404 error display the default error page from Jetty (including Powered Jetty 9.4.xxxx).

We should have a way to configure a user provided error page.

---

Originally reported by olamy, imported from: Custom Error Handler to not display default jetty error page

• assignee: olamy
• status: Open
• priority: Major
• component(s): winstone-jetty
• resolution: Unresolved
• votes: 4
• watchers: 5
• imported: 2025-11-27

Raw content of original issue

Currently a 404 error display the default error page from Jetty (including Powered Jetty 9.4.xxxx).

We should have a way to configure a user provided error page.

[jenkins-infra-bot]

uv:

• Original comment link
• Raw content of original comment:

  AND any such page should have a link to the login page!
   Since the 404 is the default response to ANY protected URL when there is an anonymous user.
  
  The missing link to the login page on the 404 exists since ~10 years! UNRESOLVED.
  
  Here a more recent  issue to this. 
  
  https://issues.jenkins.io/browse/JENKINS-31384
  
  I try to fix that locally now and will come back when resolved. 
  
  this is not exactly the same issue but very related
  
  and the problem is..... even finding the source for the 404 in the war.... 
  

AND any such page should have a link to the login page!
Since the 404 is the default response to ANY protected URL when there is an anonymous user.

The missing link to the login page on the 404 exists since ~10 years! UNRESOLVED.

Here a more recent  issue to this. 

https://issues.jenkins.io/browse/JENKINS-31384

I try to fix that locally now and will come back when resolved. 

this is not exactly the same issue but very related

and the problem is..... even finding the source for the 404 in the war....