In order to solve this problem I should add the following line to the system.webServer/handlers element:
<add name="ApiURIs-ISAPI-Integrated-4.0"
path="/user/*"
verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS"
type="System.Web.Handlers.TransferRequestHandler"
preCondition="integratedMode,runtimeVersionv4.0" />
Where user is the controller to which belong the paths that will contain the dot.