In order to run following example, I install Io on my Ubuntu 14.04.
But many Addons donot work.

> 
> Socket  
> 
>  Size  
> 
> [URL](https://stackoverflow.com/questions/25078127/io-language-exception-object-does-not-respond-to-url/25078526#25078526) ...
> 
> 
> 

I follow the [post](http://jetpackweb.com/blog/2011/02/05/installing-the-io-language-in-ubuntu/) to install Io on my Ubuntu 14.04.

Io example code from "Seven language in Seven Weeks":

```
futureResult := URL with("http://bing.com/") @fetch
writeln("Do something immediately while fetch goes on in background...")

writeln("This will block until the result is available.")

writeln("fetched ", futureResult size, " bytes")

```

Refs: