URL validation seems off

[clash99]

Steps to reproduce the error

When creating a new organization, enter an invalid url such as as.df in organization url field.

Actual behavior

Seems to accept any string with a period in it (doesn't accept asdf but does accept as.df)

Expected behavior

I would expect to get an error and that it wouldn't accept as.df as a url.

[seav]

as.df is accepted by Django because it looks like a valid domain name. (Although .df is not currently an assigned CCTLD.)

[amplifi]

Agreed; this is expected behavior and default for Django. URL validation checks that the string is formatted correctly, not that the URL entered corresponds to an existing domain/page. It would be unwieldy to continuously ensure that organization URLs are valid sites. For examples and definitions, see: https://mathiasbynens.be/demo/url-regex