Small updates to interface printing

src/print_dir.rs

@@ -1,7 +1,7 @@
 use std::{fs, io};
 use std::net::IpAddr;
 use std::path::Path;
-use if_addrs::{Interface, get_if_addrs};
+use if_addrs::{get_if_addrs, IfAddr, Interface};
 
 fn print_single_interface<P: AsRef<Path>>(iface: Interface, port: &u16, path: P) -> io::Result<()> {
     for entry in fs::read_dir(path)? {
@@ -11,8 +11,10 @@ fn print_single_interface<P: AsRef<Path>>(iface: Interface, port: &u16, path: P)
 
         let filename = entry_path.file_name().unwrap();
 
+        if let IfAddr::V4(_) = iface.addr {
             println!("http://{}:{}/{}", iface.ip(), port, filename.to_str().unwrap());
         }
+    }
 
     Ok(())
 }