Skip to main content

History Lists

User agents often have history mechanisms, such as "Back" buttons and history lists, which can be used to redisplay a representation retrieved earlier in a session.

The freshness model (Section 4.2) does not necessarily apply to history mechanisms. That is, a history mechanism can display a previous representation even if it has expired.

This does not prohibit the history mechanism from telling the user that a view might be stale, or from honoring cache directives (e.g., Cache-Control: no-store).