CHW-4611 CachePurgePasswordRequired
cache purge-all requires a password in the request body
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Default message: cache purge-all requires a password in the request body
HTTP status:400(client)
Problem. POST /api/cache/purge-all requires the caller’s password
in the body and the field was empty. Cause. The request body was
present but password was unset or blank. Fix. Resubmit with a
non-empty password field. HTTP 400.