播放2-在所有回应上设置标题? [英] Play 2 - Set header on all responses?

问题描述

我从了解如何在Play 2.0中设置HTTP标头(scala) )?，您可以根据具体情况通过执行Ok("hello").withHeaders(PRAGMA -> "no-cache")来设置响应标头.

I'm aware from Setting HTTP headers in Play 2.0 (scala)? that you can set response headers on a case-by-case basis by doing, for example, Ok("hello").withHeaders(PRAGMA -> "no-cache").

如果要在所有操作的响应上设置该标头或几个其他标头，该怎么办?您不想在任何地方重复withHeaders.而且由于这更像是应用程序范围的配置，因此您可能不希望Action编写者必须使用其他语法来获取标头(例如OkWithHeaders(...))

What if you want to set that header, or a few different headers, on responses from all your Actions? You wouldn't want to repeat the withHeaders everywhere. And since this is more like an application-wide configuration, you might not want Action writers to have to use a different syntax to get your headers (e.g. OkWithHeaders(...))

我现在拥有的是一个基本的Controller类，看起来像

What I have now is a base Controller class that looks like

class ContextController extends Controller {
 ...
 def Ok(h: Html) = Results.Ok(h).withHeaders(PRAGMA -> "no-cache")
}

但是感觉不太正确.感觉应该有更多的AOP风格的方式来定义默认标头，并将其添加到每个响应中.

but that doesn't feel quite right. It feels like there should be more of an AOP-style way of defining the default headers and having them added to each response.

推荐答案

在您的Global.scala中，将每个调用包装在一个动作中:

In your Global.scala, wrap every call in an action:

import play.api._
import play.api.mvc._
import play.api.Play.current
import play.api.http.HeaderNames._

object Global extends GlobalSettings {

  def NoCache[A](action: Action[A]): Action[A] = Action(action.parser) { request =>
    action(request) match {
      case s: SimpleResult[_] => s.withHeaders(PRAGMA -> "no-cache")
      case result => result
    }
  }

  override def onRouteRequest(request: RequestHeader): Option[Handler] = {
    if (Play.isDev) {
      super.onRouteRequest(request).map {
        case action: Action[_] => NoCache(action)
        case other => other
      }
    } else {
      super.onRouteRequest(request)
    }
  }

}

在这种情况下，我只在dev模式下调用该动作，这对于无缓存指令最有意义.

In this case, I only call the action in dev mode, which makes most sense for a no-cache instruction.

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