Cache Images from BackBlaze B2

How can I get images from BackBlaze B2 to be cached on Cloudflare?

What I have done so far is:

  1. Create a new CNAME with name ‘cdn’ and value ‘https://f000.backblazeb2.com

After doing this, I can access a file like https://f000.backblazeb2.com/file/myBucket/myFile.png as https://cdn.myDomain.com/file/myBucket/myFile.png

  1. I created a new Page Rule: https://cdn.myDomain.com/file/myBucket/* with ‘Cache Level’ set to ‘Cache Everything’

  2. I followed the instructions from here to see if my image is cached: https://support.cloudflare.com/hc/en-us/articles/200169556-How-can-I-tell-if-Cloudflare-is-caching-my-site-or-a-specific-file-

I ran the test from https://www.webpagetest.org from the same location multiple times so the image should be cached, but each time I check I see: cf-cache-status: MISS

Does anything come to mind for why this isn’t working?

Thanks for your help.

Your configuration generally looks all right, however the origin might send some caching headers which could effectively disable the edge cache.

Can you post an actual URL?

Your server appears to send

Cache-Control: max-age=0, no-cache, no-store

Can you remove that directive?

Sorry, I’m not sure where I can change that. Would that be some setting in Cloudflare or in BackBlaze?

On your origin.

Should that not be possible, maybe try tinkering with these directives in your page rule

image

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Thank you very much for your help. I was able to successfully get caching using either of your suggested methods and see ‘cf-cache-status: HIT’ for both methods.

  1. Headers in BackBlaze are set at the bucket level. If you go to the ‘Bucket Settings’ and set ‘Bucket Info’ to {“cache-control”:“max-age=7200”} then it sets the appropriate headers for 2 hours. Note that regardless of what value I set for max-age, I still see ‘cache-control: public, max-age=14400’ when I test it on https://www.webpagetest.org.

  2. To change it in Cloudflare, you just need a page rule for Edge Cache TTL which overrides the cache expiry in the headers. Since I was only interested in caching images, I didn’t need the ‘Cache Everything’ rule. Using this method I can set the TTL to as low as 2 hours (on the free plan) as opposed to 4 hours (by changing the headers directly in the BackBlaze bucket).

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