CHW-5305 CachedContentUnavailable
cached content could not be opened for streaming; retry shortly or purge the cache entry
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Default message: cached content could not be opened for streaming; retry shortly or purge the cache entry
HTTP status:500(server)
Problem. The proxy response was resolved but its cached body could not be opened for streaming. Cause. The underlying storage backend returned an error (permissions, lost file, torn write). Fix. Retry shortly or purge the cache entry via the admin UI. HTTP 500.