>I believe a public url requires a . and something after it, such as com, biz, info, etc. But you can check for yourself. http://www.ietf.org/rfc/rfc3986.txt
>
>
>>my-server is a valid URL within my local network.
>>There is no reason to not allow a TLD.
>>It might be unusal, but those days everybody can create a own TLD, and there is no restriction to use it plain.
>>
>>just my EUR 0,02

Original Message: ... to enter a valid URL ...
A local server is a valid URL

:D

It's a big waste to use a whole TDL but there is no real restriction.

com, biz, info, etc. are called Top Level Domain. Any TLD can hold as many Second Level Domains as they like. Every Second Level Domain can hold a third level, a common domain on this level is WWW. (IOW any WWW.xxx.yyy could be accessed via xxx.yyy, because the owner of WWW.xxx.yyy must own xxx.yyy too) WWW is only a convention to notify that an URL points to a WorldWideWeb part of the internet. in the beginning this was what makes it possible for your browser to guess http:// and :80. They are not optional, your browser will add them to an just domain URL