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It is many issues already related to CORS, but unfortunately I try many solutions and can't find resolution for my one.
In development portal I get error message:
Unknown status
{ "isTrusted": true }
Basically when I check console error is related to CORS:
Access to XMLHttpRequest at 'XXXX from origin 'XXXX' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
However I did add Cors support for my request:
If I take a trace in API Proxy all works fine, just not from development portal. I did delete API and recreate it again, but same error.
Trace:
