Question

我遵循示例here在Scala中创建一个websocket客户端。我想在websocket请求中传递自定义标头。我通过扩展CustomHeader创建了HttpHeader课程。

final class CustomHeader(headerName: String, headerValue: String) extends HttpHeader {
  override def name(): String = headerName

  override def value(): String = headerValue

  override def lowercaseName(): String = name.toLowerCase

  override def renderInRequests(): Boolean = true

  override def renderInResponses(): Boolean = true
}

然后在客户端，

val headers = Seq(new CustomHeader("X-Auth-Token", authToken))
val request = new WebSocketRequest(uri = "ws://localhost:9035", extraHeaders = headers)

当我运行activator compile时，它会抛出以下错误：

type mismatch;
[error]  found   : Seq[com.apple.geo.neutron.services.notification.event.CustomHeader]
[error]  required: scala.collection.immutable.Seq[akka.http.scaladsl.model.HttpHeader]
[error] Error occurred in an application involving default arguments.
[error]     val request = new WebSocketRequest(uri = "ws://localhost:9035", extraHeaders = headers)

如何解决此错误，或者向websocket请求添加自定义标头？

Answer 1

Seq这里不是一个不可变的Seq。尝试将headers定义为：

val headers = scala.collection.immutable.Seq(new CustomHeader("X-Auth-Token", authToken))

Answer 2

回答我自己的问题。感谢this线程，我发现了一种添加自定义标头的工作方式。这是我做的：

final class CustomHeader(headerValue: String) extends ModeledCustomHeader[CustomHeader] {
    override val companion = CustomHeader

    override def value(): String = headerValue

    override def renderInRequests(): Boolean = true

    override def renderInResponses(): Boolean = true
}

object CustomHeader extends ModeledCustomHeaderCompanion[CustomHeader] {
    override val name = "X-Auth-Token"

    override def parse(value: String) = Try(new CustomHeader(value))
}

然后，websocket请求创建为：

val headers = scala.collection.immutable.Seq(new CustomHeader(authToken))
val request = new WebSocketRequest(uri = "ws://localhost:9035", extraHeaders = headers)

向scala WebSocketRequest添加自定义标头

2 个答案: