Delta

Delta is an approach to implementing a 304 Not Modified leveraging DB change tracking.

The approach uses a last updated timestamp from the database to generate an ETag. All dynamic requests then have that ETag checked/applied.

This approach works well when the frequency of updates is relatively low. In this scenario, the majority of requests will leverage the result in a 304 Not Modified being returned and the browser loading the content its cache.

Effectively consumers will always receive the most current data, while the load on the server is reduced.