HTTP Framework for Time-Based Access to Resource States - Memento

Document Type


Publication Date


Publication Title

The RFC Series


7089 (1-50)


The HTTP-based Memento framework bridges the present and past Web. It facilitates obtaining representations of prior states of a given resource by introducing datetime negotiation and TimeMaps. Datetime negotiation is a variation on content negotiation that leverages the given resource's URI and a user agent's preferred datetime. TimeMaps are lists that enumerate URIs of resources that encapsulate prior states of the given resource. The framework also facilitates recognizing a resource that encapsulates a frozen prior state of another resource.


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Original Publication Citation

Van De Sompel, H., Nelson, M., & Sanderson, R. (2013). HTTP framework for time-based access to resource states - Memento. The RFC Series, 1-50, Article 7089.


0000-0003-3749-8116 (Nelson)