WIP: catch "route already exists in Publishing API" error #1211
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We had a situation earlier whereby Short URL Manager tried and failed to apply a redirect to an existing route, despite the 'override existing' field set to 'no'. The response was a 422 and no error message, which meant the user had to get in touch with support.
We should investigate and fix the 'override existing' check, as well as do a better job at surfacing errors.
I tried and failed to recreate the scenario here in several different test files, but it may be useful as a starting point for whoever picks up the card.
Trello: https://trello.com/c/PVcAt5Ll/3178-surface-path-reserved-errors-in-ui
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