scala - 如何在喷雾中从响应 'set-cookie' header 转换为请求 'cookie' header ？

Question

我正在尝试使用 spray-client和 spray-httpx我无法弄清楚如何从 HttpResponse 转换“set-cookie” header 到我想在 HttpRequest 上设置的“cookie” header

val responseSetCookieHeaders = response.headers filter { _.name == "Set-Cookie" }
...
val requestCookieHeader:HttpHeader = ???
...
addHeader(requestCookieHeader) ~> sendReceive ~> { response => ??? }

我确实看到了 spray.http.HttpHeaders.Cookie ，但我认为无法从 HttpHeader 的实例转换至 HttpCookie ...

Answer 1

HttpHeaders.Cookie是一个带有 unapply 的案例类方法。所以你可以用一个简单的函数从响应中提取它:

def getCookie(name: String): HttpHeader => Option[HttpCookie] = {
  case Cookie(cookies) => cookies.find(_.name == name)
}

这是一个更一般的情况，但我认为解决方案很清楚。

我会通过以下方式做到这一点:

// some example response with cookie
val httpResponse = HttpResponse(headers = List(`Set-Cookie`(HttpCookie("a", "b"))))

// extracting HttpCookie
val httpCookie: List[HttpCookie] = httpResponse.headers.collect { case `Set-Cookie`(hc) => hc }

// adding to client pipeline
val pipeline = addHeader(Cookie(httpCookie)) ~> sendReceive