Error response statut in fetch with other website

[helveden]

Hello, I am currently testing adonisjs and I have a problem with status 0 during a fetch call from site 1 to site 2.

Site 1 has a form where I send the data in fetch
Site 2 does receive the POST request and sends a response in json.
Google chrome see the status 200 or 5OO, when I change the value
response.status (200)

I do not understand the error.

For the moment I test the url and a basic json to see the request and the answer.

You can help me ?
Regards