Demonstrate a strange behavior of WS.

ws.scala

import scala.util._
import scala.concurrent._
import scala.concurrent.duration._

import play.api.libs.json._
import play.api.libs.ws._

case class GistFile(val filename: String, val content: String)

case class Gist(val token: String) {

  def jsonStringForGist(description: String, public: Boolean, files: Set[GistFile]): String = {
    val filesJson = Json.toJson(files.map(gf ⇒ (gf.filename -> Json.obj("content" -> gf.content))).toMap)
    val gistJson = Json.obj(
      "description" -> description,
      "public" -> public, 
      "files" -> filesJson
    )
    Json.stringify(gistJson)
  }

  def createGist(description: String, public: Boolean, file: GistFile): Future[Try[String]] = 
    createGist(description, public, Set(file))

  def createGist(description: String, public: Boolean, files: Set[GistFile]): Future[Try[String]] = {
    import scala.concurrent.ExecutionContext.Implicits.global
    val respF: Future[Response] = WS.url("https://api.github.com/gists")
                                  .withHeaders("Authorization" -> s"token $token")
                                  .post(jsonStringForGist(description, public, files))
    
    respF.map((resp: Response) => Try {
      (resp.json \ "html_url").as[String]
    })
  }
}

object Test extends App {
  import play.api.libs.concurrent.Execution.Implicits._

  val shortContent = Random.alphanumeric.take(160).grouped(80).map(_.mkString).mkString("\n")
  val longContent = Random.alphanumeric.take(1024 * 100).grouped(80).map(_.mkString).mkString("\n")
  val token = "fillyourgithubtoken"

  val f1 = Gist(token).createGist("short gist example", true, GistFile("short.txt", shortContent))
  val f2 = Gist(token).createGist("long gist example", true, GistFile("long.txt", longContent))
  
  // Await.result(f2, 60.seconds) match {
  //   case Success(url) => println("url: " + url)
  //   case Failure(e) => println("e: " + e)
  // }

  f2 onSuccess {
    case Success(url) => println("url: " + url)
    case Failure(e) => println("e: " + e)  
  }
}