3.5.1 Abstract Data Model
This section describes a conceptual model of possible data organization that an implementation maintains to participate in this protocol. The described organization is provided to facilitate the explanation of how the protocol behaves. This document does not mandate that implementations adhere to this model as long as their external behavior is consistent with that described in this document.
Conceptually, the download server is acting as a file server, that is, the URL maps to a piece of content with fixed size and modification time. The server maintains the following data for the URL:
DATA_BUFFER: A buffer of the URL content.
DATA_LENGTH: A 64-bit integer containing the length of the URL content.
DATA_TIMESTAMP: The last-modified time of the URL content.