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Scala.jsのFuture/Promiseを使ってAjaxでPOSTするとき

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こちらの記事を参考にScala.jsでFuture/Promiseを使ってXMLHttpRequestでPOSTするときにうまくいかないところがあったのでメモ。

data match {
  case Some(d) => 
    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded") // これを追記
    req.send(d)
  case None => req.send()
}

これを追記しないとRailsとかヘッダーを見るアプリケーションサーバではPOSTとみなしてくれなかった。

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