Hi,
It seems the “requestJira (https://developer.atlassian.com/platform/forge/custom-ui-bridge/requestJira/)” method from bridge does not support “POST” method.
I made a simple request from my custom-ui to '/rest/api/3/search', 'POST'
but got:
The link in the image points to: https://api.atlassian.com/ex/jira/25f9fe20-a132-4b38-acfa-e50f0031f18f/rest/api/3/search
Options passed is like: {method: "POST", headers: headers, body: body}