Tinny files timeout on CDN that uses Blob storage as origin.

Edmond Varga 11

Hi,

I'm trying to figure out why certain requests timeout on our website that's hosted on Azure Blob Storage and uses a CDN for some more control over the incoming requests. Just to note, caching is not enabled.
The affected files are quite tinny, for example in one of the cases a 3kb helper file took ~19s to load then suddenly the server cut out the request. When inspecting the logs, I've noticed the error: OriginTimeout and error code 503 and 504 respectively. I'm wondering, what causes these timeouts as the website itself doesn't have a huge traffic (10-15 visitors / day). Where should I look for answers, on the CDN or the Blob service?

(UPDATE: included a more descriptive screenshot):

Regarding the Blob service, we have a StorageV2 (general purpose v2) with a HOT access tier and a standard endpoint type. Should we upgrade to premium maybe?

Any suggestion is welcome,
Thanks!

KapilAnanth-MSFT 47,046 Reputation points Microsoft Employee

2022-11-24T06:09:02.567+00:00

Hi @Edmond Varga ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are facing originTimeout with Azure CDN with Storage Account as Origin.

Currently, the OriginTimeout value is configured as 30s for Azure CDN and this is not configurable.

Make sure you have configured the endPoint for General Web Delivery
Refer: Optimize Azure CDN for the type of content delivery

If this is done, and the issue still prevails,

Can you try to access the Website directly (from a machine in same region as your Storage Account) and see if the timetaken is similar to what we see in CDN Logs? (under HAR logs)

Cheers,
Kapil
Edmond Varga 11 Reputation points

2022-11-24T07:09:24.53+00:00

Hi @KapilAnanth-MSFT ,

The endpoint is set to general web delivery:

This issue affected but a small subset of our users (~5%) in the last week, they were from different regions, Denmark, UK, France, etc., but I can't reproduce it, it's totally random. What's worse, I can't even prepare for it as the error is thrown by the browser importing the dependencies (Javascript ES6 module imports) into our web components which are crashing after this 30s as once the server cuts out the request, what's annoying is that these files are tinny but a couple KBs.
Edmond Varga 11 Reputation points

2022-11-24T07:23:08.037+00:00

Hi @KapilAnanth-MSFT ,

Such coincidence, this time is our staging portal, this doesn't use any CDN, it's just a blob storage configured as a static webpage. I was refreshing the page a couple of times and it happened again. Now a 2 minute timeout, the file with all its dependencies affected weights 13kb:
Dave Morse 1 Reputation point

2023-01-10T14:45:41.66+00:00

Did you ever find a solution for this? We are experiencing the same issue with Azure CDN using a blob storage container as the origin.
Jaise Augustine 0 Reputation points

2023-02-03T08:32:30.1633333+00:00

I would also like to add that we are also affected by this issue. FIles with a few KBs takes sometimes more than 30 seconds to be cached in CDN and then results in cdn timeout.
Micah Rairdon 0 Reputation points

2023-02-23T14:03:29.0233333+00:00

We're experiencing the same issue as well
Florian Thiberville 0 Reputation points

2023-10-20T13:42:27.63+00:00

Same problem here. Any news?

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Tinny files timeout on CDN that uses Blob storage as origin.

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