I have an empty file on amazon s3, which I’m caching through cloudflare using a DNS CNAME record and page rules. Currently when I hit: speedtest-c0.waveform.com, this empty file gets downloaded, which is what I want.
I want to do a
fetch on this file to figure out what is the latency, and I’m using
ResourceTimingApi to find out the time to first byte (
ttfb ) but in order to do that I need to have the
Timing-Allow-Origin: * header on the response. Amazon’s S3 doesn’t have support for that header though… so I was wondering if I could add that header through cloudflare caches.
I can see here that I can interact with the cache using a worker, but that seems to be for caching requests that are hitting the worker itself. How would I modify the cache key for a request that is not going to my “worker” and is going to a different location.
Does the caches API control the same cache that would get used for speedtest-c0.waveform.com?