http-ehlo

greet.go

package main

import (
    "fmt"
    "net/http"
    "regexp"
)

func main() {
    reg := regexp.MustCompile("^/greeting/([a-z]+)$")
    http.ListenAndServe(":8080", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        switch r.URL.Path {
        case "/":
            fmt.Fprint(w, "Hello World!")
        default:
            fmt.Fprintf(w, "Hello, %s", reg.FindStringSubmatch(r.URL.Path)[1])
        }
    }))
}

greet.rs

extern crate hyper;
extern crate regex;

use std::io::Write;
use regex::{Regex, Captures};

use hyper::Server;
use hyper::server::{Request, Response};
use hyper::net::Fresh;
use hyper::uri::RequestUri::{AbsolutePath};

fn handler(req: Request, res: Response<Fresh>) {
    let greeting_re = Regex::new(r"^/greeting/([a-z]+)$").unwrap();

    match req.uri {
        AbsolutePath(ref path) => match (&req.method, &path[..]) {
            (&hyper::Get, "/") => {
                hello(&req, res);
            },
            _ => {
                greet(&req, res, greeting_re.captures(path).unwrap());
            }
        },
        _ => {
            not_found(&req, res);
        }
    };
}

fn hello(_: &Request, res: Response<Fresh>) {
    let mut r = res.start().unwrap();
    r.write_all(b"Hello World!").unwrap();
    r.end().unwrap();
}

fn greet(_: &Request, res: Response<Fresh>, cap: Captures) {
    let mut r = res.start().unwrap();
    r.write_all(format!("Hello, {}", cap.at(1).unwrap()).as_bytes()).unwrap();
    r.end().unwrap();
}

fn not_found(_: &Request, mut res: Response<Fresh>) {
    *res.status_mut() = hyper::NotFound;
    let mut r = res.start().unwrap();
    r.write_all(b"Not Found\n").unwrap();
}

fn main() {
    let _ = Server::http("127.0.0.1:8080").unwrap().handle(handler);
}