Is this a valid url?

My question below is:

Is this a valid URL?

https://example.com/css/login.css?12.1

My questions is basically is the "." ok in 12.1 for th开发者_如何学Ce query string?

Yes, it is.

In essence this means that the only characters you can reliably use for the actual name parts of a URL are a-z, A-Z, 0-9, -, ., _, and ~. Any other characters need to be Percent encoded.

Source.

Yes Correct Url.Please Go Through the official URL validation criteria over this https://www.rfc-editor.org/rfc/rfc3986.