Course of Raku / Functional, concurrent, reactive, and web programming / Web programming / Cro 101 / Exercises / A second route

Solution: A second route

Here is a possible solution to the task.

Code

use Cro::HTTP::Router;
use Cro::HTTP::Server;

my $application = route {
    get -> 'hello' {
        content 'text/plain', 'Hello from Cro!';
    }
    get -> 'bye' {
        content 'text/plain', 'Goodbye!';
    }
}

my $server = Cro::HTTP::Server.new(
    :host('127.0.0.1'),
    :port(8080),
    :application($application),
);
$server.start;

say 'Listening on http://127.0.0.1:8080 — press Ctrl-C to stop';

react {
    whenever signal(SIGINT) {
        $server.stop;
        done;
    }
}

🦋 You can find the source code in the file second-route.raku.

Output

Goodbye!

Comments

1. A route block can hold as many routes as you like; each get handles one path.

2. Cro matches the request path to the right route, so /hello and /bye return their own responses.

3. As on the theory page, .start returns immediately, so the closing react block keeps the program alive until you press Ctrl-C — whenever signal(SIGINT) then stops the server and ends the reaction.

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