pub fn main(world: World) -> Void raises {
    let maybe_request: Maybe<String> = std.args.get(1)
    if !maybe_request.has {
        check world.err.write("usage: pass HTTP request envelope\n")
        return
    }
    let net: Net = std.net.host()
    let client: HttpClient = std.http.client(net)
    var response: [512]u8 = [0_u8; 512]
    let result: HttpResult = std.http.fetch(client, std.mem.span(maybe_request.value), response, std.time.ms(5000))
    if std.http.resultOk(result) {
        check world.out.write("http request ok\n")
        return
    }
    check world.err.write("http request failed\n")
}