Cargo.toml

[package]
name = "wtf"
version = "0.1.0"
authors = ["vird <virdvip@gmail.com>"]

[dependencies]
tokio-proto = "0.1.1"
tokio-minihttp = { git = "https://github.com/tokio-rs/tokio-minihttp" }
tokio-service = "0.1.0"
futures = "0.1.14"
env_logger = "0.4.3"

main.rs

extern crate env_logger;
extern crate futures;
extern crate tokio_minihttp;
extern crate tokio_proto;
extern crate tokio_service;

use std::io;

use futures::future;
use tokio_minihttp::{Request, Response, Http};
use tokio_proto::TcpServer;
use tokio_service::Service;

/// `HelloWorld` is the *service* that we're going to be implementing to service
/// the HTTP requests we receive.
///
/// The tokio-minihttp crate, and much of Tokio itself, are centered around the
/// concept of a service for interoperability between crates. Our service here
/// carries no data with it.
///
/// Note that a new instance of `HelloWorld` is created for each TCP connection
/// we service, created below in the closure passed to `serve`.
struct HelloWorld;

impl Service for HelloWorld {
    type Request = Request;
    type Response = Response;
    type Error = io::Error;
    type Future = future::Ok<Response, io::Error>;

    fn call(&self, _request: Request) -> Self::Future {
        let mut resp = Response::new();
        resp.body("Hello, world!");
        future::ok(resp)
    }
}

fn main() {
    drop(env_logger::init());
    let addr = "0.0.0.0:8080".parse().unwrap();
    TcpServer::new(Http, addr)
        .serve(|| Ok(HelloWorld));
}

test_me.sh

#!/bin/sh
curl http://localhost:8080/
echo ""
curl -X POST http://localhost:8080/
echo ""
curl -X POST -d 'somenoise'     http://localhost:8080/
echo ""
curl -X POST -d 'some noise'    http://localhost:8080/
echo ""
curl -X POST -d 'some noise1111111111111111111111111111111111111111111111111'    http://localhost:8080/
echo ""
curl -X POST -d ' singlespace_is_ok'    http://localhost:8080/
echo ""
curl -X POST -d ' multi_space is ok?'    http://localhost:8080/
echo ""

echo "now fail comes"
curl -X POST -d ' multi space is ok?'    http://localhost:8080/
curl -X POST -d ' b bbbbbbbbb'  http://localhost:8080/
curl         -d ' b bbbbbbbbb'  http://localhost:8080/
curl -X POST -d 'a b bbbbbbbbb' http://localhost:8080/
curl         -d 'a b bbbbbbbbb' http://localhost:8080/