When you successfully log in to the REST Web Services server, it will return a session identifier with its HTTP response. The HTTP client that you use must present that session identifier each time it interacts with the REST Web Services server. One method for handling the session identifier is to allow the server to set it in a cookie file for the client.

The specific procedure you use to handle the session identifier depends on the client software you are using. The examples in Logging In as an External User and Logging In as an Internal User show how one HTTP client stores the session identifier in a cookie file.