CORS issue on displaying image while using google function api call

Hello,
I'm facing a CORS issue while displaying network images returned by an api call on google function.

I'm calling an api to retrieve objects from google shopping which contain an image url field.
Displaying is ok on mobile, web test mode and flutterflow deploying site (mywebsite.flutterflow.app), but on my website (hosted on firebase) i've got a cors issue.

The api call has been configured on flutterflow api section and i checked the "Make private" and "require authentification" switch, so the function is hosted in google functions.

Here the error :

Access to XMLHttpRequest at 'https://encrypted-tbn1.gstatic.com/shopping?q=tbn:ANd9GcQFnlmkjYMHJiyw5ymtWI7tsOubYEwcVAiyeXIN0L36-494MLGok2jVu91yBb3vX3E4oXAy0rMUQ0mUtGRTHyaRD3akc1FIXSNR43AIHJY&usqp=CAE' from origin 'https://mywebsite.fr' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Did i miss something ?

Thanks for the help.