@yoshuawuyts This code is worked.
And it is also my current solution, but I want to make my code look more neat and elegant.
So implement the trait ToSocketAddrs is probably the best solution.

pub struct DomainName(pub String, pub u16);

...
// implement Deserialize for DomainName
...

#[derive(Deserialize)]
pub enum Address {
    /// IP Address
    SocketAddr(SocketAddr),
    /// Domain name address, eg. example.com:8080
    Domain(DomainName),
}

#[derive(Deserialize)]
pub struct Config {
    pub addr: Address,
}

...
let config: Config = <deserialize from config file>;
...

// This is neat and elegant.
let listener = TcpListener::bind(config.addr);

I vote for it that support ToSocketAddr for (String, u16).

To implement ToSocketAddrs for a custom type the ToSocketAddrsFuture should be pub use #539

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