GitHub Webhook client locks up hyper after 1 request

[brianloveswords]

Here's a minimal repro:

extern crate hyper;

use hyper::server::{Request, Response};
use std::io::Read;

// If a github webhook client requests this route, after serving that request successfully
// it will never respond to another request from any client again.
fn hello(req: Request, res: Response) {
    let mut req = req;
    println!("request received, processing");
    println!("loading body into string");
    let mut payload = String::new();
    if req.read_to_string(&mut payload).is_err() {
        println!("could not read body into string");
        return res.send(b"nope").unwrap();
    }
    println!("done, responding");
    res.send(b"yep").unwrap();
}

fn main() {
    let _listening = hyper::Server::http("0.0.0.0:4200").unwrap()
        .handle(hello);
    println!("Listening on 0.0.0.0:4200");
}

This responds perfectly fine to curls but if this is set to be a GitHub webhook receiver, the server will stop accepting requests after it successfully serves the first one.

[brianloveswords]

This is a dupe of #368