Rust API call on Africa's Talking

api_call.rs

extern crate reqwest;
#[macro_use]
extern crate hyper;

use hyper::header::{Accept, Headers};

header! {(Apikey, "apikey") => [String]}

fn send_request(url: &str, apikey: String) -> Result<reqwest::Response, reqwest::Error> {
    let mut headers = Headers::new();
  
    headers.set(Accept::json());
    headers.set(Apikey(apikey));
  
    let client = reqwest::Client::new();
    let resp = client.get(url).headers(headers).send();
    
    resp
}

fn main(){
    let apikey = String::from("d2cb5a86944fd45f279e8dba28c693c65801ba6ea0840df1ac625f6e08b88a7e");
    let url = "http://api.sandbox.africastalking.com/version1/user?username=sandbox";
    
    let mut resp = String::from("");
    let err_msg = String::from("Error handling request.");
    resp = match send_request(url, apikey).unwrap().text() {
        Ok(txt) => txt,
        Err(_) => err_msg
    };
    
    println!("{}", resp);
}