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https://issues.apache.org/jira/browse/TC-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123271#comment-16123271
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Steve Malenfant commented on TC-151:
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[~shemesh] Are we talking about the XML ID or the HOST_REGEXP?
Maybe I'm wrong, but the XML ID is not part of the FQDN.
> Delivery Service XML IDs should be limited to lower-case letters
> ----------------------------------------------------------------
>
> Key: TC-151
> URL: https://issues.apache.org/jira/browse/TC-151
> Project: Traffic Control
> Issue Type: New Feature
> Components: Traffic Ops
> Affects Versions: 1.7.0
> Reporter: Oren Shemesh
> Priority: Minor
> Labels: delivery_service, xml-id
>
> The DNS system is case-insensitive. Since a delivery service XML ID is used
> as part of the FQDN of the cache being redirected to, two different DSs
> cannot differ only by case.
> This leads to the conclusion that it is best if we limit the XML IDs of
> delivery services to be lower-case only.
> This would achieve the following:
> 1. Make domain names used by TC 'conventional' (i.e. lower-case only)
> 2. Remove the possibility of a case-conflict between DSs
> 3. Currently, Traffic Router does not behave correctly when a DS XML ID
> contains upper case letters. Limiting to lower-case would prevent the need to
> fix this :-)
> Current problems with TR behaviour, when an XML ID contains opper-case letter
> are:
> 1. The TR sends a redirect to a host FQDN which contains a lower-case version
> of the DS XML ID
> 2. The TR does not resolve the lower-case version of the host FQDN.
> Here is an example to demo current bug in TR. DS XML ID is opencachehub-DT,
> TR redirects to opencachehub-dt, and then refused to resolve the cache name
> using this DS (a lot of irrelevant data was removed fro this text):
> $ curl -L -s -D -
> http://tr.opencachehub-DT.stage-cdn.tc-stage.cqloud.com/video01.mp4 -v
> * Connected to tr.opencachehub-DT.stage-cdn.tc-stage.cqloud.com
> (54.244.152.242) port 80 (#0)
> > GET /video01.mp4 HTTP/1.1
> > Host: tr.opencachehub-DT.stage-cdn.tc-stage.cqloud.com
> > Accept: */*
> >
> < HTTP/1.1 302 Moved Temporarily
> < Location:
> http://p39-edge-lab.opencachehub-dt.stage-cdn.tc-stage.cqloud.com/video01.mp4
> < Content-Length: 0
> <
> * Connection #0 to host tr.opencachehub-DT.stage-cdn.tc-stage.cqloud.com left
> intact
> * Issue another request to this URL:
> 'http://p39-edge-lab.opencachehub-dt.stage-cdn.tc-stage.cqloud.com/video01.mp4'
> * getaddrinfo(3) failed for
> p39-edge-lab.opencachehub-dt.stage-cdn.tc-stage.cqloud.com:80
> * Couldn't resolve host
> 'p39-edge-lab.opencachehub-dt.stage-cdn.tc-stage.cqloud.com'
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