How to use the appier.route function in appier

    @appier.route("/async/sender", "GET")
    async def sender(self):
        import asyncio
        sleep = self.field("sleep", 1.0, cast = float)
        self.request.set_content_type("text/plain")
        await asyncio.sleep(sleep)
        await self.request.send(b"Sender (1)\n")
        await asyncio.sleep(sleep)
        await self.request.send(b"Sender (2)\n")
        await asyncio.sleep(sleep)
        await self.request.send(b"Sender (3)\n")

    @appier.route("/hello/", "GET")
    def hello_count(self, count):
        return dict(
            message = "hello world %d" % count
        )

    @appier.route("/async/file", "GET")
    def file(self):
        file_path = self.field("path", None, mandatory = True)
        delay = self.field("delay", 0.0, cast = float)
        thread = self.field("thread", False, cast = bool)
        type, _encoding = mimetypes.guess_type(file_path, strict = True)
        type = type or "application/octet-stream"
        self.request.content_type = type
        for value in appier.header_a(): yield value
        for value in appier.ensure_a(
            self.read_file,
            args = [file_path],
            kwargs = dict(delay = delay),
            thread = thread
        ): yield value

    @appier.route("/hello", "GET")
    def hello(self):
        return dict(
            message = "hello world"
        )

    @appier.route("/async/http", "GET")
    async def http(self):
        url = self.field("url", "https://www.flickr.com/")
        delay = self.field("delay", 0.0, cast = float)
        self.request.content_type = "text/html"
        await appier.sleep(delay)
        yield await appier.get_w(url)

    @appier.route("/async/hello", "GET")
    def hello(self):
        partial = self.field("partial", True, cast = bool)
        handler = self.handler_partial if partial else self.handler
        yield from appier.header_a()
        yield "before\n"
        yield from handler()
        yield "after\n"

    @appier.route("/async/create", ("GET", "POST"))
    async def create_(self):
        name = self.field("name", "John Doe")
        person = Person(name = name)
        await person.save_a()
        person = await person.reload_a(map = True)
        return json.dumps(person)

    @appier.route("/hello.tpl", "GET")
    def hello_template(self):
        return self.template(
            "hello.txt",
            message = "hello world"
        )

    @appier.route("/async/file", "GET")
    async def file(self):
        file_path = self.field("path", None, mandatory = True)
        delay = self.field("delay", 0.0, cast = float)
        thread = self.field("thread", False, cast = bool)
        type, _encoding = mimetypes.guess_type(file_path, strict = True)
        type = type or "application/octet-stream"
        self.request.content_type = type
        await appier.ensure_a(
            self.read_file,
            args = [file_path],
            kwargs = dict(delay = delay),
            thread = thread
        )