Example of how to implement graceful shutdown for the web service.
From the examples/hello_world_until directory:
Terminal 1:
$ cargo run
Compiling hello_world (file:///.../examples/hello_world)
Finished dev [unoptimized + debuginfo] target(s) in 4.26 secs
Running `../hello_world`
Listening for requests at http://127.0.0.1:7878
Press Ctrl+C to exit
Terminal 2:
$ curl -v http://127.0.0.1:7878/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 7878 (#0)
> GET / HTTP/1.1
> Host: 127.0.0.1:7878
> User-Agent: curl/7.54.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Length: 12
< Content-Type: text/plain
< X-Request-ID: 88ec311c-fc77-4d2e-b302-b1ba38718d96
< X-Frame-Options: DENY
< X-XSS-Protection: 1; mode=block
< X-Content-Type-Options: nosniff
< X-Runtime-Microseconds: 51
< Date: Fri, 05 Jan 2018 06:25:00 GMT
<
* Connection #0 to host 127.0.0.1 left intact
Hello World!%
Terminal 1 again:
<press Ctrl+C>
Ctrl+C pressed
Shutting down gracefully
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