Setting up a basic HTTP server

Let's start our chapter by bringing the famous Hello World program into the 21^st century by hosting it on a server. We are going to use the hyper crate for this, which is a strongly typed wrapper around all things HTTP. In addition to being one of the fastest HTTP implementations in the world (https://www.techempower.com/benchmarks/#section=data-r15&hw=ph&test=plaintext), it is used by nearly all major high-level frameworks (https://github.com/flosse/rust-web-framework-comparison#high-level-frameworks), the only exception being the ones that reimplemented it all on the extremely basic stringly-typed TCP library that Rust provides under std::net::TcpStream.

Getting ready

All hyper recipes work with futures, so you should read all of Chapter 8, Working with Futures, before continuing.

At the time of writing, hyper has not yet upgraded to futures v0.2 (tracking issue: https://github.com/hyperium/hyper/issues/1448), so we going to use futures v0.1. This should...