Response with status 0 for url null

Hello Guys
i need ionic developer to help me please.

I am getting this error when i am trying to use ‘@angular/http’ POST,GET request.

“ionic response with status 0 for url null”.

It was working before and today i changed something to build new release and this error appear i don’t know why.

Note that the app working on browser by “ionic serve” and lab also its working when i use cordova android@6.3.0 apk but its not on cordova android@7 and 8 apk

What i tried:

  1. Allow Cross Origin
  2. I tried to use HttpClientModule but its not working
  3. Update ionic version and cordova version but still not working

Thanks in advance