如何使用http4s处理基本的表单提交？

libraryDependencies += "org.http4s" %% "http4s-blaze-server" % "1.0.0-M27"

import cats.effect.{ExitCode, IO, IOApp}
import org.http4s._
import org.http4s.dsl.io._
import org.http4s.implicits._

object FormServer extends IOApp {
  def processForm(form: UrlForm): IO[Response[IO]] = {
    // 处理表单数据的逻辑代码
    val name = form.getFirstOrElse("name", "")
    val age = form.getFirstOrElse("age", "")
    Ok(s"Hello $name! Your age is $age.")
  }

  val routes: HttpRoutes[IO] = HttpRoutes.of[IO] {
    case req @ POST -> Root / "submit" =>
      req.decode[UrlForm] { form =>
        processForm(form)
      }
  }

  val httpApp: HttpApp[IO] = routes.orNotFound

  def run(args: List[String]): IO[ExitCode] =
    BlazeServerBuilder[IO]
      .bindHttp(8080, "localhost")
      .withHttpApp(httpApp)
      .serve
      .compile
      .drain
      .as(ExitCode.Success)
}