The service is available from http://cloud.grammaticalframework.org/. The source code for hosting a local version of the webservice is distributed in the GF distribution, hence users that have GF installed on their own computer can also run the service locally by starting GF with the parameter

--server[=port] Run in HTTP server mode on given port (default 41296).

Requests are made via HTTP with the GET or POST method. (The examples below show GET requests, but POST is preferred for requests that change the state on the server.) Data in requests is in the application/x-www-form-urlencoded format (the format used by default by web browsers when submitting form data). Data in responses is usually in JSON format. The HTTP response code is usually 200, but can also be 204 (after file upload), 404 (file to download or remove was not found), 400 (for unrecognized commands or missing/unacceptable parameters in requests) or 501 (for unsupported HTTP request methods). Unrecognized parameters in requests are silently ignored.

More details on how to run the service are given in Deliverable 2.3 on page 7 under "Building a web application".