May I ask how to initiate ajax requests in the defined node? When I request, I always report cross-domain errors. The backend engineer also configured the cosr response header, but it still does not help
By ajax I assume you just mean making a HTTP Request FROM Node-RED to an external HTTP Server (using the built in http-request node)?
If yes, then this is probably due to the external HTTP server CORS settings.
Check the server sends the correct Access-Control-Allow-* headers.
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