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Special:EntityData results in Internal Server Error on revision IDs of non-entity pages
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When Special:EntityData is called with a revision parameter that belongs to a different page than the page of the requested entity, then an HTTP 404 error is returned; however, if the other page is not an entity page, then an HTTP 500 error is returned instead – according to the debug log, EntityDataRequestHandler attempts to deserialize the content as JSON and doesn’t catch the resulting MWContentSerializationException.

Example on Wikidata:

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