Zeppelin REST API error getting paragraph results - 405 Method not allowed

Question

From various other StackOverflow posts I understand I can do a Zeppelin API call to run and get the output from a paragraph using the URL:

https://[zeppelin url]:[port]/api/notebook/run/[note ID]/[paragraph ID]

but this gives me:

HTTP ERROR 405
Problem accessing /api/notebook/run/2GG52SU6/2025492809-066545_207456631. Reason:
Method Not Allowed

Is there a way of fixing this? Other API calls work fine and the paragraph runs fine in the Zeppelin Web UI (it just does a simple Impala query). I just want to get the output via a REST API so I can call it from an Angular paragraph and manipulate the results before display.

Thanks!