!htc #16494 provide content negotiation fallback to exception handlers

akka-http-core/src/main/java/akka/http/model/japi/headers/Accept.java

@@ -13,6 +13,8 @@ import akka.http.model.japi.MediaRange;
 public abstract class Accept extends akka.http.model.HttpHeader {
     public abstract Iterable<MediaRange> getMediaRanges();
 
+    public abstract boolean acceptsAll();
+
     public static Accept create(MediaRange... mediaRanges) {
         return new akka.http.model.headers.Accept(akka.http.model.japi.Util.<MediaRange, akka.http.model.MediaRange>convertArray(mediaRanges));
     }

akka-http-core/src/main/scala/akka/http/model/MediaType.scala

@@ -22,6 +22,7 @@ sealed abstract class MediaRange extends japi.MediaRange with Renderable with Wi
   def isMultipart = false
   def isText = false
   def isVideo = false
+  def isWildcard = mainType == "*"
 
   /**
    * Returns a copy of this instance with the params replaced by the given ones.
@@ -123,6 +124,7 @@ object MediaRanges extends ObjectRegistry[String, MediaRange] {
     def matches(mediaType: MediaType) = true
     def specimen = MediaTypes.`text/plain`
   }
+  val `*/*(minQ)` = `*/*`.withQValue(Float.MinPositiveValue)
   val `application/*` = new PredefinedMediaRange("application/*") {
     def matches(mediaType: MediaType) = mediaType.isApplication
     override def isApplication = true

akka-http-core/src/main/scala/akka/http/model/headers/headers.scala

@@ -129,6 +129,7 @@ final case class Accept(mediaRanges: immutable.Seq[MediaRange]) extends japi.hea
   import Accept.mediaRangesRenderer
   def renderValue[R <: Rendering](r: R): r.type = r ~~ mediaRanges
   protected def companion = Accept
+  def acceptsAll = mediaRanges.exists(mr ⇒ mr.isWildcard && mr.qValue > 0f)
 
   /** Java API */
   def getMediaRanges: Iterable[japi.MediaRange] = mediaRanges.asJava