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CORS error accessing POAP API


We are using POAP API for some time, and around last week we starting to get CORS errors:
Access to XMLHttpRequest at '' from origin ... has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Tried to switch to, didn't help.

Can't find anything in your documentation / help. Could you give a suggestion where to look for a solution?