Return the host IPvFuture address
string_view
host_ipvfuture() noexcept;
Declared in file <src/url_view_base.cpp> at line 393
If the host type is host_type::ipvfuture, this function returns the address as a string. Otherwise, if the host type is not an IPvFuture address, it returns an empty string.
assert( url_view( "http://[v1fe.d:9]/index.htm" ).host_ipvfuture() == "v1fe.d:9" );
Constant.
Throws nothing.
IPvFuture = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )