site property Null safety
Web assets are identified by a URL that contains only the scheme, hostname and port parts.
The format is http[s]://[:] Hostnames must be fully qualified: they
must end in a single period ("
."). Only the schemes "http" and "https"
are currently allowed. Port numbers are given as a decimal number, and
they must be omitted if the standard port numbers are used: 80 for http
and 443 for https. We call this limited URL the "site". All URLs that
share the same scheme, hostname and port are considered to be a part of
the site and thus belong to the web asset. Example: the asset with the
https://www.google.com contains all these URLs: *
But it does not contain these URLs: *
https://google.com/ (hostname does not match) *
https://www.google.com:444/ (port does not match) REQUIRED