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Also double check the "rest" section of your environment.*.ts configuration file for the User Interface. Make sure it's also pointing to the exact same URL as that "dspace.server.url" setting. Again, check the mode, domain, port and paths all match exactly. 

"XMLHttpRequest.. has been blocked by CORS policy" or "CORS error" or "Invalid CORS request"

If you are seeing a CORS error in your browser, this means that you are accessing the REST API via an "untrusted" client application.  To fix this error, you must change your REST API / Backend configuration to trust the application.

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