Return the host name
<boost/url/authority_view.hpp>
template<string_token::StringToken StringToken = string_token::return_string>
StringToken::result_type
host_name(StringToken&& token) const;
If the host type is host_type::name, this function returns the name as a string. Otherwise, if the host type is not a name, it returns an empty string. Any percent-escapes in the string are decoded first.
assert( url_view( "https://www%2droot.example.com/" ).host_name() == "www-root.example.com" );
Linear in this->host_name().size().
Calls to allocate may throw.
host        = IP-literal / IPv4address / reg-name
IP-literal  = "[" ( IPv6address / IPvFuture  ) "]"
reg-name    = *( unreserved / pct-encoded / "-" / ".")
| Name | Description | 
|---|---|
| token | A string token to receive the result |