Returns a list of real-time servers that can be used for long-polling updates to the [event stream](#get-events). Long polling is the concept where a HTTP request is kept open until the server sends a response, then repeating the process over and over to receive updated responses. Long polling the event stream can only be used for user events, not for enterprise events. To use long polling, first use this endpoint to retrieve a list of long poll URLs. Next, make a long poll request to any of the provided URLs. When an event occurs in monitored account a response with the value `new_change` will be sent. The response contains no other details as it only serves as a prompt to take further action such as sending a request to the [events endpoint](#get-events) with the last known `stream_position`. After the server sends this response it closes the connection. You must now repeat the long poll process to begin