[Django] #36790: Refactor error view handlers to be generic

[Django]

#36790: Refactor error view handlers to be generic
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Reporter: Wes P. | Type: Cleanup/optimization
Status: new | Component: HTTP handling
Version: 6.0 | Severity: Normal
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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In a PR review discussion (see:
https://github.com/django/django/pull/17960/files) which was reviewing
ticket #35281 (adding a new handler for 413 errors) it was expressed that
there should be a better way to allow developers to access handlers
instead of creating handlers for every kind of 4xx or 5xx error: a generic
method. Ticket #35281 switched from being about a 413 handler (fairly
easy) to refactoring error view handlers.

I would like ticket #35281 to revert to being about handling 413 errors
(which was accepted) and for this ticket to be about refactoring error
view handlers to be generic. I would also recommend that we preserve
backward compatibility without deprecating the existing handlers.

Documentation for error views:
https://docs.djangoproject.com/en/6.0/ref/views/#error-views
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Ticket URL: <https://code.djangoproject.com/ticket/36790>
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