将以下配置添加到Akka Http服务器的application.conf中：

akka.http.server {
  # Enabling CORS support
  cors {
    # If enabled, all origins will be allowed. This setting overrides `allowedOrigins`.
    allow-all-origins = true

    # List of origins that are allowed to make requests to the server.
    allowedOrigins = ["*"]

    # List of HTTP headers that should be allowed.
    allowedHeaders = []

    # List of HTTP methods that should be allowed.
    allowedMethods = []

    # If enabled, cookies can be included in CORS requests.
    allowCredentials = true
  }
}

在启动Akka Http服务器之前，还需要添加以下依赖关系：

libraryDependencies += "com.typesafe.akka" %% "akka-http-cors" % "1.1.1"

使用akka-grpc-client来调用gRPC服务的示例代码：

val system = ActorSystem("MySystem")
implicit val mat = ActorMaterializer.create(system)
implicit val ec = system.dispatcher
val clientSettings = GrpcClientSettings.connectToServiceAt("localhost", 8080).withTls(false)
val client = AkkaGrpcClient(clientSettings)
val responseFuture: Future[MyResponse] = client.myService.myMethod(MyRequest())
responseFuture.onComplete {
  case Success(response) => println(s"Received response: $response")
  case Failure(e) => e.printStackTrace()
}

使用Akka HTTP来调用gRPC服务的示例代码：

val system = ActorSystem("MySystem")
implicit val mat = ActorMaterializer.create(system)
implicit val ec = system.dispatcher

val responseFuture: Future[HttpResponse] =
  Http().singleRequest(HttpRequest(
    method = HttpMethods.POST,
    uri = "http://localhost:8080/myService/myMethod",
    entity = HttpEntity(ContentTypes.`application/grpc+proto`, MyRequest().toByteArray),
    headers = List(RawHeader("te", "trailers"))
  ))

responseFuture.flatMap { response =>
  val unmarshalPromise = Promise[MyResponse]()
  response.entity.dataBytes
    .via(Grpc.grpcFramingDecoder)
    .map(_.bytes)