Need to add a a header when returning an asset using the Play Framework Assets Controller

问题

I need to return pdf files with the header

X-Robots-Tag: noindex

https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag?hl=de#robots-meta-tag-verwenden

Is there a way to do this using the standard play Assets Controller? Took a look inside the source code and the only thing that seems to be configurable is:

val configuredCacheControl = config(_.getString("\"assets.cache." + name + "\""))

Thanks

回答1:

I might go with Kris's idea. Something kinda like this should get you part of the way there, basically all I'm doing is leveraging the Play! Controller that serves static resources but adding a header to the result:

object AssetsController extends Controller {

def modifiedAsset(path: String, file: String): Future[Result] = Async.action { implicit request =>
  Assets.at(path, file)(request).map { result => 
   result.withHeaders(("X-Robots-Tag", "noindex"))
  }
}

Then your routes file would need to be modified from controllers.Assets.at(path="/public", file) to controllers.AssetsController.modifiedAsset(path="/public", file)

来源：https://stackoverflow.com/questions/36942470/need-to-add-a-a-header-when-returning-an-asset-using-the-play-framework-assets-c