CODEWITHSUNDEEP
google-cloud-cdn
DaWe
DaWe

Reputation: 1702

Cache JSON for 1 second with Google CDN to reduce server load

I'm looking for a solution to reduce server load on my API. I thought it's a good idea to cache the content for 1 second, so the server will get only 1 requests each second instead of many. However, I wasn't able to make it work:

I'm quite surprised no one uses short-lived caches for API-s, since it can theoretically reduce load and maybe save costs when using with external APIs (eg. you don't need to pay twice if you request the same thing from an expensive API endpoint). Any ideas?

Upvotes: 0

Views: 475

Answers (2)

elving
elving

Reputation: 1533

When using the "Use origin settings based on Cache-Control headers" cache mode, you can instruct Google Cloud CDN to cache a response for 1 second by including a Cache-Control: public, max-age=1 response header.

The problem with your earlier attempt appears to be a typo: the correct directive is max-age (with a hyphen), not max_age (with an underscore).

Upvotes: 1

Dave
Dave

Reputation: 529

In order to cache an object, even if you are using the honor origin cache mode, you need to have a valid content-range header. Using the force cache all mode will decorate the object with the cache control directive Cloud CDN needs to cache the object, even if the origin doesn't have the directive- FORCE_CACHE_ALL basically takes whatever the origin pushes out and overwrites the cache control directive.

If you are using the UX, you are correct, the console doesn't allow you to set a lower TTL value; however, you can set a lower TTL via gCloud commands

gcloud compute backend-services update BACKEND_SERVICE_NAME --client-ttl=1 --default-ttl=1 --global

Upvotes: 2

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