Beginning Amazon Web Services With Node.js by Adam Shackelford

Author:Adam Shackelford [Shackelford, Adam]
Language: eng
Format: epub
Tags: Linux, Computers, JavaScript, Operating Systems, Programming Languages
ISBN: 9781484206539
Google: 0GAnCgAAQBAJ
Publisher: Apress
Published: 2015-03-18T20:38:27+00:00

Caching

Now it’s time to see CloudFront’s caching in action. Make another POST request to /photos/upload, this time with the caption “Hello London.” Then, make another GET request to /photos/search?query=Hello. The response should be lightning fast, but if you look closely at the JSON, you will not see your most recent photo, “Hello London.” This is because after the first request, CloudFront is now storing a cached object for the address /photos/search?query=Hello. It will continue to send the same response to all requests for this URL, until the object expires. But when does it expire?

Each object stored in the cache is linked to a behavior, and its expiration is determined by the value of several fields in the corresponding behavior, shown in Figure 4-12.

Figure 4-12.Important CloudFront behavior fields when determining object caching

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