CORS error on /api/3/deals but not on /api/3/contacts

Hi,

I’m developing a VueJS app which has to call the API to retrieve data from contacts and theirs deals information.
I use fetch.

My problem is that I have a CORS issue when I call /api/3/deals :
“Access to fetch at ‘https://myUrl.com/api/3/deals?api_key=myKey’ from origin ‘http://localhost:8080’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. If an opaque response serves your needs, set the request’s mode to ‘no-cors’ to fetch the resource with CORS disabled.”

Why can I fetch /contacts and not /deals?
Does anyone have had the same problem?

Thanks for your help

For those who have the same problem, I found a solution : https://stackoverflow.com/questions/43871637/no-access-control-allow-origin-header-is-present-on-the-requested-resource-whe