Am 16.02.2016 um 17:40 schrieb Louie Bacani Foronda: 

import vibe.d;
import std.stdio;

shared static this()
{
	auto settings = new HTTPServerSettings;
	settings.port = 8080;
	settings.bindAddresses = ["::1", "127.0.0.1"];
	listenHTTP(settings, &hello);
	logInfo("Please open http://127.0.0.1:8080/ in your browser.");
}


void hello(HTTPServerRequest req, HTTPServerResponse res){
	writeln("running once or twice?");
	res.writeBody("Yep you are here...");
}

I created a simple project, I noticed that things are running twice?

the console says

Please open http://127.0.0.1:8080/ in your browser
running once or twice?
running once or twice?

It is definitely running twice, why is that?

The browser is probably requesting "/favicon.ico" in addition to "/".
Try to print req.requestURL to know for sure.