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Cloudfront caching resources even though response headers should prevent it

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DanH

I have recently setup a Cloudfront distribution with the following behaviour cache policy:

  • TTL settings:
    • Minimum TTL (seconds): 0
    • Maximum TTL (seconds): 31536000
    • Default TTL (seconds): 0
  • Cache Keys:
    • Headers - None
    • Cookies - None
    • Query strings - All

Unfortunately pages with no-cache response headers continue to cache the response at fairly low levels of concurrency. I used apachebench to run 100 requests with concurrency of 5, and received the following:

    100 Cache-Control: no-cache, no-store, must-revalidate, max-age=0
     25 X-Cache: Hit from cloudfront
     75 X-Cache: Miss from cloudfront

I also captured what should be unique response headers that should be unique per request/response (given there are no request headers/cookies) and this also shows that there are duplicate Set-Cookie responses. For example, this response came back 4 times:

      4 Set-Cookie: csrftoken=h2uU7TKHJ6AicHgOIaJTwC5qIXJN4Zwf; Domain=.mysite.com; expires=Tue, 17-Jan-2023 15:10:37 GMT; Max-Age=31449600; Path=/

I do have ways around this I believe, such as higher priority Cloudfront behaviours to set a no-cache policy, however it takes the power away from the server-side to decide whether a response should dynamically be cached, and indicates that Cloudfront is not honouring the server-side decision.

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