S3 Service Endpoint for eu-west-1 (Ireland)

Question

I have a DNS record that is a CNAME to `my-bucket-name.s3-eu-west-1.amazonaws.com`. This DNS record predates my time, but has always worked as expected.

However, reviewing https://docs.aws.amazon.com/general/latest/gr/s3.html#s3_region suggests that the correct S3 endpoint to use would be `my-bucket-name.s3.eu-west-1.amazonaws.com` (note the dot between `s3` and `eu`, instead of the dash).

Is there any reason not to update the endpoint to the one with the dot, e.g. are there any behavioural differences between these two endpoints? By default I would not make the change as we know the current behvaiour is fine, but Terraform is awanting me to make the change.

Accepted Answer

Older S3 buckets seem to have such an endpoint.  
https://docs.aws.amazon.com/AmazonS3/latest/userguide/VirtualHosting.html#VirtualHostingBackwardsCompatibility  
> s3‐Region
> Some older Amazon S3 Regions support endpoints that contain a dash (-) between s3 and the Region code (for example, s3‐us-west-2), instead of a dot (for example, s3.us-west-2). If your bucket is in one of these Regions, you might see the following endpoint format in your server access logs or CloudTrail  logs:  
> 
> https://bucket-name.s3-region-code.amazonaws.com

Answer

The official explanation can be found here :
[https://docs.aws.amazon.com/AmazonS3/latest/userguide/VirtualHosting.html]()

> Some older Amazon S3 Regions support endpoints that contain a dash (-) between s3 and the Region code (for example, s3‐us-west-2), instead of a dot (for example, s3.us-west-2).

Answer

Hello.

Isn't what you're looking at a website endpoint?  
Depending on the region, this may be a hyphen or a period.  
https://docs.aws.amazon.com/AmazonS3/latest/userguide/WebsiteEndpoints.html  
> Depending on your Region, your Amazon S3 website endpoint follows one of these two formats.  
> * s3-website dash (-) Region ‐ http://bucket-name.s3-website-Region.amazonaws.com  
> * s3-website dot (.) Region ‐ http://bucket-name.s3-website.Region.amazonaws.com

In the case of eu-west-1, it is a hyphen as described in the document below.  
I don't think it will affect operation as it is region specific.  
https://docs.aws.amazon.com/general/latest/gr/s3.html#s3_website_region_endpoints  
> s3-website-eu-west-1.amazonaws.com

S3 Service Endpoint for eu-west-1 (Ireland)

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