TYPO3 Core

Problem also appears in TYPO3 CMS v9.5.

It occurs in frontend and brings you to a white empty page once you have configured an error handler with the option "Show content from page" and specified a typo3 page as result of the error handler. Use an external link as result of an error handler basically works only as long you pass a protocol and hostname.

How have I produced this?
I have configured an error handler in the backend site management module "sites" for the case that a typo3 page is not found (http status code 404). I have used the option "Show content from page" (field "How to handle errors") and specified a typo3 page (typo link) in the field "Show Content From Page" as result of the error handler. As soon a frontend page request leads to a "page not found" (http status code 404), it tries to show the specified page, but the result is a white empty page instead of the specified one though.

I have taken a look into it and dove through the code to find out what causes the problem. It seems like the underlying cause is the class "PageContentErrorHandler". This page error handler uses the resource fetching method "GeneralUtility::getUrl". In this certain case the method gets passed a path without protocol and hostname, but it seems like this method requires this both fragments to be passed though.

This should have been fixed with #86935 - I tried the following short test with TYPO3 9.5.15 and the following configuration (only relevant part shown):

base: '/'
baseVariants: {  }
errorHandling:
  -
    errorCode: '404'
    errorHandler: Page
    errorContentSource: 't3://page?uid=235'

rootPageId: 1
routes: {  }

and after calling a non-existent url, the page uid=235 has been shown

therefore I think that the issue has been solved. Am I missing something or is a different test necessary?

@Ben Robinson thank you very much for your patience and quick reply;

I close this issue as resolved.

If you think that this is the wrong decision or experience the issue again, please reopen it or open a new issue with a reference to this one and a step-by-step guide about how to reproduce it. Thank you again.