Requests can be anonymous to have Presto treat the user as a guest. To send anonymous requests, include the x-p-anonymous Presto header/parameter in the URL or as an HTTP header.

In all other cases, the first request to Presto must supply user identity information. This creates a standard HTTP session. What is required in the initial request depends on how authentication is configured in Presto.

For authentication with SSO (single sign-on solution) or SSL with digital certificates, user identity information is supplied by those solutions. No additional authentication information is required in the request.

For authentication using basic credentials, you must use the REST API method to login to create a Presto session and authenticate the user. This adds a cookie with session information which is then included in all subsequent requests. You can also use the REST API method to logout and end the session or simply let the session expire (based on Presto timeout configuration).