On the machine where you installed the API server, open a browser window.
In the address line, type the following: http://localhost/selapi/sel/v1/$metadata.
The site’s metadata appears in the browser in xml format:
The first time you connect, it may take some time because the application has to load the metadata in all connected plants.
Next, test the connection from a remote machine. In the browser's address field, type a URI using the syntax
'https://<Base URL>/selapi/sel/v1/$metadata', for example:
You should see the same site metadata in xml format as you did on the local Web API server machine.