ip.rs

// cargo-deps: reqwest="0.9.9", serde="1.0", serde_derive="1.0"

#[macro_use]
extern crate serde_derive;

#[derive(Deserialize)]
struct Ip {
    origin: String
}

fn main() -> Result<(), Box<std::error::Error>> {
    let url = "http://httpbin.org/ip";
    let mut response = reqwest::get(url)?;
    let object: Ip = response.json()?;
    println!("{}", object.origin);
    Ok(())
}