NoSQL Database REST API Authentication

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I would like to access the cloud NoSQL database using the REST API. The documentation here seems to indicate that I can authenticate REST requests with only a username and password. However, when I try that, I get a 500 error: "The server encountered an internal error or misconfiguration and was unable to complete your request."

I tried the Javascript sample code for REST API here and the sample works fine for getting the user details using REST. However, if I modify that sample to instead get a list of NoSQL tables, I get the "InternalServerError" error again. (See NodeJS code snippet below)