3213417 - CORS issue when connecting to a remote system in an MTA application

When trying to connect to a remote system in your MTA app, you get the following error in the console logs:

Access to XMLHttpRequest at <...> from origin <...> has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

SAP BTP, Cloud Foundry environment

cors, XMLHttpRequest, access-control-allow-origin, header is present on the requested resource, mta, btp, business technology platform, destination, xs-app.json , KBA , CA-BAS-MTA , Multi target applications in Business Application Studio , BC-CP-CF-DS , Cloud Foundry MTA Deployment Service , CA-WDE-MTA , SAP Web IDE Multi Target App: create, build, deploy , BC-CP-DEST , Destination service , Problem