HTTP/1.0 request without "Keep-Alive", res.end() not close connection.

[AndrewTsao]

extern crate hyper;
extern crate env_logger;

use std::io::Write;

use hyper::Server;
use hyper::server::{Request, Response};
use hyper::net::Fresh;
use hyper::header::{ContentLength};

fn hello(_: Request, mut res: Response<Fresh>) {
    let body = b"Hello World!";
    res.send(body).unwrap();
}

fn main() {
    env_logger::init().unwrap();
    println!("start listening on 3000");
    Server::http("127.0.0.1:3000").unwrap().handle_threads(hello, 3).unwrap();
}

I started server

RUST_LOG=trace ./target/debug/web-server

then I use `telnet command start a http request like this:

andi@andi-box:~/rust/web-server$ telnet localhost 3000
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET / HTTP/1.0

HTTP/1.0 200 OK
Date: Sun, 05 Jul 2015 15:09:37 GMT
Content-Length: 12

Hello World!

but connection not closed.

DEBUG:hyper::server: Incoming stream
TRACE:hyper::buffer: read_into_buf pos=0, cap=4096
TRACE:hyper::buffer: slicing (0, 16, 4096)
TRACE:hyper::buffer: read_into_buf pos=16, cap=4096
TRACE:hyper::buffer: slicing (0, 18, 4096)
DEBUG:hyper::server::request: Request Line: Get AbsolutePath("/") Http10
DEBUG:hyper::server::request: Headers { }
TRACE:hyper::http: should_keep_alive( Http10, None )
TRACE:hyper::header: Headers.set( "Content-Length", ContentLength(12) )
DEBUG:hyper::server::response: writing head: Http10 Ok
TRACE:hyper::header: Headers.set( "Date", Date(HttpDate(Tm { tm_sec: 17, tm_min: 12, tm_hour: 15, tm_mday: 5, tm_mon: 6, tm_year: 115, tm_wday: 0, tm_yday: 185, tm_isdst: 0, tm_utcoff: 0, tm_nsec: 280907766 })) )
DEBUG:hyper::server::response: headers [
Headers { Content-Length: 12, Date: Sun, 05 Jul 2015 15:12:17 GMT, }]
DEBUG:hyper::server::response: write 12 bytes
TRACE:hyper::server::response: ending
TRACE:hyper::http: should_keep_alive( Http10, None )
DEBUG:hyper::server: keep_alive = true for 127.0.0.1:46167
TRACE:hyper::buffer: read_into_buf pos=0, cap=4096

The server trace log show connection is keeping alive. why?

[reem]

You must send Connection: Close to signal to the client that they should not use keep alive on this connection. See the relevant section of the spec: https://tools.ietf.org/html/rfc7230#section-6.6

[reem]

If we immediately closed the connection then the client may not be able to fully read the final response, as noted in the spec.

[seanmonstar]

No, as Http 1.0, it should close the connection unless keepalive was passed
by the client. It's a bug in the should_keep_alive function.

On Sun, Jul 5, 2015, 12:34 PM Jonathan Reem notifications@github.com
wrote:

If we immediately closed the connection then the client may not be able to
fully read the final response, as noted in the spec.

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