I uploaded a Spring Boot jar file (Rest API) to my Synology Nas. Now I tried to execute a request from my computer. That worked too. I have an Ionic Angular app that also executes requests (http Request). However, no request goes through in the Ionic app. I get the following message back: CORS error (Cross Origin Resource Sharing error: CorsDisabledScheme). Does anyone know what that means?

UPDATE: I added the following headers: .set('Access-Control-Allow-Origin', '*') .set('Access-Control-Allow-Credentials','true') .set('Access-Control-Allow-Methods: OPTIONS, GET, POST','true') .set('Access-Control-Allow-Headers','Content-Type, Depth, User-Agent, X-File-Size, X-Requested-With, If-Modified-Since, X-File-Name, Cache-Control') However, now I get the following message: (blocked:mixed-content)

PS: the Site is hosted on Vercel... maybe its something with https.. ?