Here is a possible cause of the 404 error:
An IRIS REST service [or Cache REST service] supports the OPTIONS request (the CORS preflight request – used to determine whether a REST service supports CORS). This request is executed by the CSPSystem user. This user should have READ permission on any databases used by the REST service; if not, the service will respond with an HTTP 404 error.
Several of our doc. instances were broken for a couple of days. Root cause is that we had upgraded from an unreleased version to a later unreleased version. We're going to try not to do that again.
Also see https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY...
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