On 22/10/2019 15:56, Ben Schwartz wrote: > Sure. For example, tumblr limits usernames to 32 characters: > https://unwrapping.tumblr.com/post/58535402323/tips-tumblr-username > > These usernames also form the subdomain part of the *.tumblr.com > wildcard, so the longest allowed name is [32 chars].tumblr.com. > > I expect that most wildcard TLS hosts impose similar limits. >
Fair enough. Sub-domains (or whatever may be the right term) can have such limits. However, IIUC most services ilke hosters or CDNs will just allow anything that's a valid DNS name so I argue that our design target ought be to handle that well. (The current spec does handle it, but not, IMO, well;-) Cheers, S.
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