I close this ticket and for them who have the same problem, on ovh i have disable the firewall on the .ovhconfig at the root
With a new prestashop 1.7.6.7 i got the same bug when i want to delete an attribute of a product but instead a 403 error i got :
Oops! An Error Occurred
The server returned a "405Method Not Allowed".
Something is broken. Please let us know what you were doing when this error occurred. We will fix it as soon as possible. Sorry for any inconvenience caused.
I don't undertsand, on a Mac in localhost how can it bug?