Rest Api \ APi

I cannot find the API service. I entered the Windchill server in the localhost section, but when I try to access it via http://localhost:80/Windchill/servlet/rest/v1/contexts  or Swagger, I get the following error:

Failed to fetch. Possible Reasons:

CORS Network Failure URL scheme must be "http" or "https" for CORS request. It also gives a 404 error. I need to connect to the API in order to use it for my middleware application and perform operations, but I'm having trouble connecting to the API. In fact, I don't have a proper API at hand.