Front Door Caching - See performance gain

Nibbler 656

Hi Q&A,

How can I check if content is getting served by the Azure Front Caching/Build-in CDN. I'm not seeing anything changed in the URL's ( like xxxx.cdn.xxx. Like one would if using CloudFlare CDN etc.

I dont really find any detailed documentation on this subject, with screendums and settings/best pratice.

Thanks.

2 answers

TravisCragg-MSFT 5,681 Reputation points Microsoft Employee

2020-10-31T03:22:09.183+00:00

Azure Front Door (like most other CDNs) use the X-Cache header to show if the content has been served by the cache. You can use any program that shows response headers to view this, and also view the time it takes for the content to be served.
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Nibbler 656 Reputation points

2020-11-01T12:02:59.2+00:00

Hi Travis,

Thanks for feedback. I did test this, and only see X-Azure-Ref header.

The caching is enabled, so the reason for my question.

Also, I don't see any real performance gain when using Front Door when caching is enabled v. disabled. Other then the amount of backed requests have dropped.
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TravisCragg-MSFT 5,681 Reputation points Microsoft Employee

2020-11-03T18:05:07.77+00:00

Depending upon the location of your site & the location of the edge location, the performance gain might not be significant from that computer. It might be quite significant if the user has a high latency to your site. It is always best to test yourself and see what performance gains you will get out of the service.
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Nibbler 656 Reputation points

2020-11-03T19:40:44.417+00:00

Hi Travis,

Thanks. I think my expectations was a bit higher, but I agree. When testing from another country, I see a greater performance gain.

Lastly, could you comment on the missing “X-Cache header”… I don’t se this, only the X-Azure

Nibbler 656 Reputation points

2020-11-06T21:07:36.403+00:00

Hi Travis,

Any news on this one?
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