diff --git a/akka-http-core/src/main/scala/akka/http/model/ContentType.scala b/akka-http-core/src/main/scala/akka/http/model/ContentType.scala
index 5ce944a83f..ec1c672fdb 100644
--- a/akka-http-core/src/main/scala/akka/http/model/ContentType.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/ContentType.scala
@@ -15,13 +15,23 @@ final case class ContentTypeRange(mediaRange: MediaRange, charsetRange: HttpChar
     case HttpCharsetRange.`*` ⇒ r ~~ mediaRange
     case x                    ⇒ r ~~ mediaRange ~~ ContentType.`; charset=` ~~ x
   }
+
+  /**
+   * Returns a [[ContentType]] instance which fits this range.
+   */
+  def specimen: ContentType = ContentType(mediaRange.specimen, charsetRange.specimen)
 }
 
 object ContentTypeRange {
   val `*` = ContentTypeRange(MediaRanges.`*/*`)
 
-  implicit def apply(mediaType: MediaType): ContentTypeRange = apply(MediaRange(mediaType), HttpCharsetRange.`*`)
+  implicit def apply(mediaType: MediaType): ContentTypeRange = apply(mediaType, HttpCharsetRange.`*`)
   implicit def apply(mediaRange: MediaRange): ContentTypeRange = apply(mediaRange, HttpCharsetRange.`*`)
+  implicit def apply(contentType: ContentType): ContentTypeRange =
+    contentType.definedCharset match {
+      case Some(charset) ⇒ apply(contentType.mediaType, charset)
+      case None          ⇒ ContentTypeRange(contentType.mediaType)
+    }
 }
 
 final case class ContentType(mediaType: MediaType, definedCharset: Option[HttpCharset]) extends japi.ContentType with ValueRenderable {
diff --git a/akka-http-core/src/main/scala/akka/http/model/FormData.scala b/akka-http-core/src/main/scala/akka/http/model/FormData.scala
index 8348b77407..30d731cf33 100644
--- a/akka-http-core/src/main/scala/akka/http/model/FormData.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/FormData.scala
@@ -5,14 +5,16 @@
 package akka.http.model
 
 /**
- * Model for `application/x-www-form-urlencoded` form data.
+ * Simple model for `application/x-www-form-urlencoded` form data.
  */
-final case class FormData(fields: Uri.Query) {
-  type FieldType = (String, String)
-}
+final case class FormData(fields: Uri.Query)
 
 object FormData {
   val Empty = FormData(Uri.Query.Empty)
+
   def apply(fields: Map[String, String]): FormData =
     if (fields.isEmpty) Empty else FormData(Uri.Query(fields))
+
+  def apply(fields: (String, String)*): FormData =
+    if (fields.isEmpty) Empty else FormData(Uri.Query(fields: _*))
 }
\ No newline at end of file
diff --git a/akka-http-core/src/main/scala/akka/http/model/HttpCharset.scala b/akka-http-core/src/main/scala/akka/http/model/HttpCharset.scala
index f1bb65e1fb..f405fba42f 100644
--- a/akka-http-core/src/main/scala/akka/http/model/HttpCharset.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/HttpCharset.scala
@@ -19,6 +19,11 @@ sealed abstract class HttpCharsetRange extends japi.HttpCharsetRange with ValueR
   def qValue: Float
   def matches(charset: HttpCharset): Boolean
 
+  /**
+   * Returns a [[HttpCharset]] instance which fits this range.
+   */
+  def specimen: HttpCharset
+
   /** Java API */
   def matches(charset: japi.HttpCharset): Boolean = {
     import japi.JavaMapping.Implicits._
@@ -32,7 +37,7 @@ object HttpCharsetRange {
     final def render[R <: Rendering](r: R): r.type = if (qValue < 1.0f) r ~~ "*;q=" ~~ qValue else r ~~ '*'
     def matches(charset: HttpCharset) = true
     def matchesAll: Boolean = true
-
+    def specimen = HttpCharsets.`UTF-8`
     def withQValue(qValue: Float) =
       if (qValue == 1.0f) `*` else if (qValue != this.qValue) `*`(qValue.toFloat) else this
   }
@@ -42,7 +47,7 @@ object HttpCharsetRange {
     require(0.0f <= qValue && qValue <= 1.0f, "qValue must be >= 0 and <= 1.0")
     def matches(charset: HttpCharset) = this.charset.value.equalsIgnoreCase(charset.value)
     def matchesAll: Boolean = false
-
+    def specimen = charset
     def withQValue(qValue: Float) = One(charset, qValue)
     def render[R <: Rendering](r: R): r.type = if (qValue < 1.0f) r ~~ charset ~~ ";q=" ~~ qValue else r ~~ charset
   }
diff --git a/akka-http-core/src/main/scala/akka/http/model/HttpMessage.scala b/akka-http-core/src/main/scala/akka/http/model/HttpMessage.scala
index d71ed5c0af..8e1e8fbd17 100644
--- a/akka-http-core/src/main/scala/akka/http/model/HttpMessage.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/HttpMessage.scala
@@ -250,7 +250,8 @@ final case class HttpRequest(method: HttpMethod = HttpMethods.GET,
 
   override def withMethod(method: akka.http.model.japi.HttpMethod): HttpRequest = copy(method = method.asInstanceOf[HttpMethod])
   override def withProtocol(protocol: akka.http.model.japi.HttpProtocol): HttpRequest = copy(protocol = protocol.asInstanceOf[HttpProtocol])
-  override def withUri(path: String): HttpRequest = copy(uri = Uri(path))
+  override def withUri(path: String): HttpRequest = withUri(Uri(path))
+  def withUri(uri: Uri): HttpRequest = copy(uri = uri)
 
   /** Java API */
   override def getUri: japi.Uri = japi.Accessors.Uri(uri)
diff --git a/akka-http-core/src/main/scala/akka/http/model/MediaType.scala b/akka-http-core/src/main/scala/akka/http/model/MediaType.scala
index bf8f3cce11..85f2d694ac 100644
--- a/akka-http-core/src/main/scala/akka/http/model/MediaType.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/MediaType.scala
@@ -34,6 +34,11 @@ sealed abstract class MediaRange extends japi.MediaRange with Renderable with Wi
    */
   def withCharset(charsetRange: HttpCharsetRange): ContentTypeRange = ContentTypeRange(this, charsetRange)
 
+  /**
+   * Returns a [[MediaType]] instance which fits this range.
+   */
+  def specimen: MediaType
+
   /** Java API */
   def getParams: util.Map[String, String] = {
     import collection.JavaConverters._
@@ -72,6 +77,7 @@ object MediaRange {
     override def isMultipart = mainType == "multipart"
     override def isText = mainType == "text"
     override def isVideo = mainType == "video"
+    def specimen = MediaType.custom(mainType, "custom")
   }
 
   def custom(mainType: String, params: Map[String, String] = Map.empty, qValue: Float = 1.0f): MediaRange = {
@@ -95,6 +101,7 @@ object MediaRange {
     def withParams(params: Map[String, String]) = copy(mediaType = mediaType.withParams(params))
     def withQValue(qValue: Float) = copy(qValue = qValue)
     def render[R <: Rendering](r: R): r.type = if (qValue < 1.0f) r ~~ mediaType ~~ ";q=" ~~ qValue else r ~~ mediaType
+    def specimen = mediaType
   }
 
   implicit def apply(mediaType: MediaType): MediaRange = apply(mediaType, 1.0f)
@@ -114,34 +121,42 @@ object MediaRanges extends ObjectRegistry[String, MediaRange] {
 
   val `*/*` = new PredefinedMediaRange("*/*") {
     def matches(mediaType: MediaType) = true
+    def specimen = MediaTypes.`text/plain`
   }
   val `application/*` = new PredefinedMediaRange("application/*") {
     def matches(mediaType: MediaType) = mediaType.isApplication
-    override def isApplication: Boolean = true
+    override def isApplication = true
+    def specimen = MediaTypes.`application/json`
   }
   val `audio/*` = new PredefinedMediaRange("audio/*") {
     def matches(mediaType: MediaType) = mediaType.isAudio
-    override def isAudio: Boolean = true
+    override def isAudio = true
+    def specimen = MediaTypes.`audio/ogg`
   }
   val `image/*` = new PredefinedMediaRange("image/*") {
     def matches(mediaType: MediaType) = mediaType.isImage
-    override def isImage: Boolean = true
+    override def isImage = true
+    def specimen = MediaTypes.`image/png`
   }
   val `message/*` = new PredefinedMediaRange("message/*") {
     def matches(mediaType: MediaType) = mediaType.isMessage
-    override def isMessage: Boolean = true
+    override def isMessage = true
+    def specimen = MediaTypes.`message/rfc822`
   }
   val `multipart/*` = new PredefinedMediaRange("multipart/*") {
     def matches(mediaType: MediaType) = mediaType.isMultipart
-    override def isMultipart: Boolean = true
+    override def isMultipart = true
+    def specimen = MediaTypes.`multipart/form-data`
   }
   val `text/*` = new PredefinedMediaRange("text/*") {
     def matches(mediaType: MediaType) = mediaType.isText
-    override def isText: Boolean = true
+    override def isText = true
+    def specimen = MediaTypes.`text/plain`
   }
   val `video/*` = new PredefinedMediaRange("video/*") {
     def matches(mediaType: MediaType) = mediaType.isVideo
-    override def isVideo: Boolean = true
+    override def isVideo = true
+    def specimen = MediaTypes.`video/mp4`
   }
 }
 
diff --git a/akka-http-core/src/main/scala/akka/http/model/Multipart.scala b/akka-http-core/src/main/scala/akka/http/model/Multipart.scala
index 08ccce6cc1..c37ade5304 100644
--- a/akka-http-core/src/main/scala/akka/http/model/Multipart.scala
+++ b/akka-http-core/src/main/scala/akka/http/model/Multipart.scala
@@ -198,7 +198,7 @@ object Multipart {
           def additionalDispositionParams = _additionalDispositionParams
           def additionalHeaders = _additionalHeaders
           def entity = _entity
-          override def toString = s"FormData.BodyPart(${_name}, ${_entity}, ${_additionalDispositionParams}, ${_additionalHeaders})"
+          override def toString = s"FormData.BodyPart($name, $entity, $additionalDispositionParams, $additionalHeaders)"
         }
 
       def unapply(value: BodyPart): Option[(String, BodyPartEntity, Map[String, String], immutable.Seq[HttpHeader])] =
@@ -266,7 +266,7 @@ object Multipart {
           def entity = _entity
           def rangeUnit = _rangeUnit
           def additionalHeaders = _additionalHeaders
-          override def toString = s"ByteRanges.BodyPart(${_contentRange}, ${_entity}, ${_rangeUnit}, ${_additionalHeaders})"
+          override def toString = s"ByteRanges.BodyPart($contentRange, $entity, $rangeUnit, $additionalHeaders)"
         }
 
       def unapply(value: BodyPart): Option[(ContentRange, BodyPartEntity, RangeUnit, immutable.Seq[HttpHeader])] =