diff --git a/akka-http-core/src/main/java/akka/http/javadsl/model/headers/TlsSessionInfo.java b/akka-http-core/src/main/java/akka/http/javadsl/model/headers/TlsSessionInfo.java
new file mode 100644
index 0000000000..d398d0d5c5
--- /dev/null
+++ b/akka-http-core/src/main/java/akka/http/javadsl/model/headers/TlsSessionInfo.java
@@ -0,0 +1,25 @@
+/**
+ * Copyright (C) 2009-2016 Typesafe Inc. <http://www.typesafe.com>
+ */
+
+package akka.http.javadsl.model.headers;
+
+import javax.net.ssl.SSLSession;
+
+/**
+ * Model for the synthetic `Tls-Session-Info` header which carries the SSLSession of the connection
+ * the message carrying this header was received with.
+ *
+ * This header will only be added if it enabled in the configuration by setting
+ * <code>akka.http.[client|server].parsing.tls-session-info-header = on</code>.
+ */
+public abstract class TlsSessionInfo extends CustomHeader {
+    /**
+     * @return the SSLSession this message was received over.
+     */
+    public abstract SSLSession getSession();
+
+    public static TlsSessionInfo create(SSLSession session) {
+        return akka.http.scaladsl.model.headers.Tls$minusSession$minusInfo$.MODULE$.apply(session);
+    }
+}
diff --git a/akka-http-core/src/main/resources/reference.conf b/akka-http-core/src/main/resources/reference.conf
index 35ae9ead17..55da20ba6e 100644
--- a/akka-http-core/src/main/resources/reference.conf
+++ b/akka-http-core/src/main/resources/reference.conf
@@ -337,5 +337,10 @@ akka.http {
       If-Unmodified-Since = 0
       User-Agent = 32
     }
+
+    # Enables/disables inclusion of an Tls-Session-Info header in parsed
+    # messages over Tls transports (i.e., HttpRequest on server side and
+    # HttpResponse on client side).
+    tls-session-info-header = off
   }
 }
diff --git a/akka-http-core/src/main/scala/akka/http/ParserSettings.scala b/akka-http-core/src/main/scala/akka/http/ParserSettings.scala
index fee8caf553..7af10fdb4b 100644
--- a/akka-http-core/src/main/scala/akka/http/ParserSettings.scala
+++ b/akka-http-core/src/main/scala/akka/http/ParserSettings.scala
@@ -27,6 +27,7 @@ final case class ParserSettings(
   illegalHeaderWarnings: Boolean,
   errorLoggingVerbosity: ParserSettings.ErrorLoggingVerbosity,
   headerValueCacheLimits: Map[String, Int],
+  includeTlsSessionInfoHeader: Boolean,
   customMethods: String ⇒ Option[HttpMethod],
   customStatusCodes: Int ⇒ Option[StatusCode]) extends HttpHeaderParser.Settings {
 
@@ -75,6 +76,7 @@ object ParserSettings extends SettingsCompanion[ParserSettings]("akka.http.parsi
       c getBoolean "illegal-header-warnings",
       ErrorLoggingVerbosity(c getString "error-logging-verbosity"),
       cacheConfig.entrySet.asScala.map(kvp ⇒ kvp.getKey -> cacheConfig.getInt(kvp.getKey))(collection.breakOut),
+      c getBoolean "tls-session-info-header",
       _ ⇒ None,
       _ ⇒ None)
   }
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/client/OutgoingConnectionBlueprint.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/client/OutgoingConnectionBlueprint.scala
index 0f76d57e3d..2bbd8df266 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/client/OutgoingConnectionBlueprint.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/client/OutgoingConnectionBlueprint.scala
@@ -100,8 +100,8 @@ private[http] object OutgoingConnectionBlueprint {
       val wrapTls = b.add(Flow[ByteString].map(SendBytes))
       terminationMerge.out ~> requestRendering ~> logger ~> wrapTls
 
-      val unwrapTls = b.add(Flow[SslTlsInbound].collect { case SessionBytes(_, bytes) ⇒ bytes })
-      unwrapTls ~> responseParsingMerge.in0
+      val collectSessionBytes = b.add(Flow[SslTlsInbound].collect { case s: SessionBytes ⇒ s })
+      collectSessionBytes ~> responseParsingMerge.in0
 
       methodBypassFanout.out(0) ~> terminationMerge.in0
 
@@ -113,7 +113,7 @@ private[http] object OutgoingConnectionBlueprint {
       BidiShape(
         methodBypassFanout.in,
         wrapTls.out,
-        unwrapTls.in,
+        collectSessionBytes.in,
         terminationFanout.out(1))
     })
 
@@ -154,8 +154,8 @@ private[http] object OutgoingConnectionBlueprint {
    * 2. Read from the dataInput until exactly one response has been fully received
    * 3. Go back to 1.
    */
-  class ResponseParsingMerge(rootParser: HttpResponseParser) extends GraphStage[FanInShape2[ByteString, HttpMethod, List[ResponseOutput]]] {
-    private val dataInput = Inlet[ByteString]("data")
+  class ResponseParsingMerge(rootParser: HttpResponseParser) extends GraphStage[FanInShape2[SessionBytes, HttpMethod, List[ResponseOutput]]] {
+    private val dataInput = Inlet[SessionBytes]("data")
     private val methodBypassInput = Inlet[HttpMethod]("method")
     private val out = Outlet[List[ResponseOutput]]("out")
 
@@ -174,7 +174,7 @@ private[http] object OutgoingConnectionBlueprint {
         override def onPush(): Unit = {
           val method = grab(methodBypassInput)
           parser.setRequestMethodForNextResponse(method)
-          val output = parser.onPush(ByteString.empty)
+          val output = parser.parseBytes(ByteString.empty)
           drainParser(output)
         }
         override def onUpstreamFinish(): Unit =
@@ -185,7 +185,7 @@ private[http] object OutgoingConnectionBlueprint {
       setHandler(dataInput, new InHandler {
         override def onPush(): Unit = {
           val bytes = grab(dataInput)
-          val output = parser.onPush(bytes)
+          val output = parser.parseSessionBytes(bytes)
           drainParser(output)
         }
         override def onUpstreamFinish(): Unit =
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/parsing/HttpMessageParser.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/parsing/HttpMessageParser.scala
index af1a3830bd..227aeb5051 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/parsing/HttpMessageParser.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/parsing/HttpMessageParser.scala
@@ -4,6 +4,10 @@
 
 package akka.http.impl.engine.parsing
 
+import javax.net.ssl.SSLSession
+
+import akka.stream.io.{ SessionBytes, SslTlsInbound }
+
 import scala.annotation.tailrec
 import scala.collection.mutable.ListBuffer
 import akka.parboiled2.CharUtils
@@ -30,11 +34,17 @@ private[http] abstract class HttpMessageParser[Output >: MessageOutput <: Parser
   private[this] var completionHandling: CompletionHandling = CompletionOk
   private[this] var terminated = false
 
+  private[this] var lastSession: SSLSession = null // used to prevent having to recreate header on each message
+  private[this] var tlsSessionInfoHeader: `Tls-Session-Info` = null
+  def initialHeaderBuffer: ListBuffer[HttpHeader] =
+    if (settings.includeTlsSessionInfoHeader && tlsSessionInfoHeader != null) ListBuffer(tlsSessionInfoHeader)
+    else ListBuffer()
+
   def isTerminated = terminated
 
-  val stage: PushPullStage[ByteString, Output] =
-    new PushPullStage[ByteString, Output] {
-      def onPush(elem: ByteString, ctx: Context[Output]) = handleParserOutput(self.onPush(elem), ctx)
+  val stage: PushPullStage[SessionBytes, Output] =
+    new PushPullStage[SessionBytes, Output] {
+      def onPush(input: SessionBytes, ctx: Context[Output]) = handleParserOutput(self.parseSessionBytes(input), ctx)
       def onPull(ctx: Context[Output]) = handleParserOutput(self.onPull(), ctx)
       private def handleParserOutput(output: Output, ctx: Context[Output]): SyncDirective =
         output match {
@@ -46,7 +56,14 @@ private[http] abstract class HttpMessageParser[Output >: MessageOutput <: Parser
         if (self.onUpstreamFinish()) ctx.finish() else ctx.absorbTermination()
     }
 
-  final def onPush(input: ByteString): Output = {
+  final def parseSessionBytes(input: SessionBytes): Output = {
+    if (input.session ne lastSession) {
+      lastSession = input.session
+      tlsSessionInfoHeader = `Tls-Session-Info`(input.session)
+    }
+    parseBytes(input.bytes)
+  }
+  final def parseBytes(input: ByteString): Output = {
     @tailrec def run(next: ByteString ⇒ StateResult): StateResult =
       (try next(input)
       catch {
@@ -102,7 +119,7 @@ private[http] abstract class HttpMessageParser[Output >: MessageOutput <: Parser
 
   def badProtocol: Nothing
 
-  @tailrec final def parseHeaderLines(input: ByteString, lineStart: Int, headers: ListBuffer[HttpHeader] = ListBuffer[HttpHeader](),
+  @tailrec final def parseHeaderLines(input: ByteString, lineStart: Int, headers: ListBuffer[HttpHeader] = initialHeaderBuffer,
                                       headerCount: Int = 0, ch: Option[Connection] = None,
                                       clh: Option[`Content-Length`] = None, cth: Option[`Content-Type`] = None,
                                       teh: Option[`Transfer-Encoding`] = None, e100c: Boolean = false,
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/server/HttpServerBluePrint.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/server/HttpServerBluePrint.scala
index 2c54a09db4..49af8de1fc 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/server/HttpServerBluePrint.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/server/HttpServerBluePrint.scala
@@ -57,16 +57,19 @@ private[http] object HttpServerBluePrint {
         requestPreparation(settings) atop
         controller(settings, log) atop
         parsingRendering(settings, log) atop
-        new ProtocolSwitchStage(settings, log) atop
-        unwrapTls
+        websocketSupport(settings, log) atop
+        tlsSupport
 
     theStack.withAttributes(HttpAttributes.remoteAddress(remoteAddress))
   }
 
-  val unwrapTls: BidiFlow[ByteString, SslTlsOutbound, SslTlsInbound, ByteString, Unit] =
-    BidiFlow.fromFlows(Flow[ByteString].map(SendBytes), Flow[SslTlsInbound].collect { case x: SessionBytes ⇒ x.bytes })
+  val tlsSupport: BidiFlow[ByteString, SslTlsOutbound, SslTlsInbound, SessionBytes, Unit] =
+    BidiFlow.fromFlows(Flow[ByteString].map(SendBytes), Flow[SslTlsInbound].collect { case x: SessionBytes ⇒ x })
 
-  def parsingRendering(settings: ServerSettings, log: LoggingAdapter): BidiFlow[ResponseRenderingContext, ResponseRenderingOutput, ByteString, RequestOutput, Unit] =
+  def websocketSupport(settings: ServerSettings, log: LoggingAdapter): BidiFlow[ResponseRenderingOutput, ByteString, SessionBytes, SessionBytes, Unit] =
+    BidiFlow.fromGraph(new ProtocolSwitchStage(settings, log))
+
+  def parsingRendering(settings: ServerSettings, log: LoggingAdapter): BidiFlow[ResponseRenderingContext, ResponseRenderingOutput, SessionBytes, RequestOutput, Unit] =
     BidiFlow.fromFlows(rendering(settings, log), parsing(settings, log))
 
   def controller(settings: ServerSettings, log: LoggingAdapter): BidiFlow[HttpResponse, ResponseRenderingContext, RequestOutput, RequestOutput, Unit] =
@@ -114,7 +117,7 @@ private[http] object HttpServerBluePrint {
       }
     })
 
-  def parsing(settings: ServerSettings, log: LoggingAdapter): Flow[ByteString, RequestOutput, Unit] = {
+  def parsing(settings: ServerSettings, log: LoggingAdapter): Flow[SessionBytes, RequestOutput, Unit] = {
     import settings._
 
     // the initial header parser we initially use for every connection,
@@ -137,7 +140,7 @@ private[http] object HttpServerBluePrint {
       case x ⇒ x
     }
 
-    Flow[ByteString].transform(() ⇒
+    Flow[SessionBytes].transform(() ⇒
       // each connection uses a single (private) request parser instance for all its requests
       // which builds a cache of all header instances seen on that connection
       rootParser.createShallowCopy().stage).named("rootParser")
@@ -344,12 +347,12 @@ private[http] object HttpServerBluePrint {
     One2OneBidiFlow[HttpRequest, HttpResponse](pipeliningLimit).reversed
 
   private class ProtocolSwitchStage(settings: ServerSettings, log: LoggingAdapter)
-    extends GraphStage[BidiShape[ResponseRenderingOutput, ByteString, ByteString, ByteString]] {
+    extends GraphStage[BidiShape[ResponseRenderingOutput, ByteString, SessionBytes, SessionBytes]] {
 
-    private val fromNet = Inlet[ByteString]("fromNet")
+    private val fromNet = Inlet[SessionBytes]("fromNet")
     private val toNet = Outlet[ByteString]("toNet")
 
-    private val toHttp = Outlet[ByteString]("toHttp")
+    private val toHttp = Outlet[SessionBytes]("toHttp")
     private val fromHttp = Inlet[ResponseRenderingOutput]("fromHttp")
 
     override def initialAttributes = Attributes.name("ProtocolSwitchStage")
@@ -432,14 +435,14 @@ private[http] object HttpServerBluePrint {
         })
 
         setHandler(fromNet, new InHandler {
-          override def onPush(): Unit = sourceOut.push(grab(fromNet))
+          override def onPush(): Unit = sourceOut.push(grab(fromNet).bytes)
         })
         sourceOut.setHandler(new OutHandler {
           override def onPull(): Unit = {
             if (!hasBeenPulled(fromNet)) pull(fromNet)
             cancelTimeout(timeoutKey)
             sourceOut.setHandler(new OutHandler {
-              override def onPull(): Unit = pull(fromNet)
+              override def onPull(): Unit = if (!hasBeenPulled(fromNet)) pull(fromNet)
             })
           }
         })
diff --git a/akka-http-core/src/main/scala/akka/http/impl/engine/ws/WebsocketClientBlueprint.scala b/akka-http-core/src/main/scala/akka/http/impl/engine/ws/WebsocketClientBlueprint.scala
index d14f627c0b..b4523a4d70 100644
--- a/akka-http-core/src/main/scala/akka/http/impl/engine/ws/WebsocketClientBlueprint.scala
+++ b/akka-http-core/src/main/scala/akka/http/impl/engine/ws/WebsocketClientBlueprint.scala
@@ -79,7 +79,7 @@ object WebsocketClientBlueprint {
         parser.setRequestMethodForNextResponse(HttpMethods.GET)
 
         def onPush(elem: ByteString, ctx: Context[ByteString]): SyncDirective = {
-          parser.onPush(elem) match {
+          parser.parseBytes(elem) match {
             case NeedMoreData ⇒ ctx.pull()
             case ResponseStart(status, protocol, headers, entity, close) ⇒
               val response = HttpResponse(status, headers, protocol = protocol)
diff --git a/akka-http-core/src/main/scala/akka/http/scaladsl/model/headers/headers.scala b/akka-http-core/src/main/scala/akka/http/scaladsl/model/headers/headers.scala
index 1e50a57d9e..7df3a213c6 100644
--- a/akka-http-core/src/main/scala/akka/http/scaladsl/model/headers/headers.scala
+++ b/akka-http-core/src/main/scala/akka/http/scaladsl/model/headers/headers.scala
@@ -8,8 +8,10 @@ import java.lang.Iterable
 import java.net.InetSocketAddress
 import java.security.MessageDigest
 import java.util
+import javax.net.ssl.SSLSession
 
 import akka.event.Logging
+import akka.stream.io.ScalaSessionAPI
 
 import scala.reflect.ClassTag
 import scala.util.{ Failure, Success, Try }
@@ -177,7 +179,6 @@ final case class `If-Range`(entityTagOrDateTime: Either[EntityTag, DateTime]) ex
   protected def companion = `If-Range`
 }
 
-// FIXME: resurrect SSL-Session-Info header once akka.io.SslTlsSupport supports it
 final case class RawHeader(name: String, value: String) extends jm.headers.RawHeader {
   val lowercaseName = name.toRootLowerCase
   def render[R <: Rendering](r: R): r.type = r ~~ name ~~ ':' ~~ ' ' ~~ value
@@ -760,6 +761,29 @@ final case class `Set-Cookie`(cookie: HttpCookie) extends jm.headers.SetCookie w
   protected def companion = `Set-Cookie`
 }
 
+/**
+ * Model for the synthetic `Tls-Session-Info` header which carries the SSLSession of the connection
+ * the message carrying this header was received with.
+ *
+ * This header will only be added if it enabled in the configuration by setting
+ *
+ * ```
+ * akka.http.[client|server].parsing.tls-session-info-header = on
+ * ```
+ */
+final case class `Tls-Session-Info`(session: SSLSession) extends jm.headers.TlsSessionInfo with ScalaSessionAPI {
+  override def suppressRendering: Boolean = true
+  override def toString = s"SSL-Session-Info($session)"
+  def name(): String = "SSL-Session-Info"
+  def value(): String = ""
+
+  /** Java API */
+  def getSession(): SSLSession = session
+
+  def lowercaseName: String = name.toRootLowerCase
+  def render[R <: Rendering](r: R): r.type = r ~~ name ~~ ':' ~~ ' ' ~~ value
+}
+
 // http://tools.ietf.org/html/rfc7230#section-3.3.1
 object `Transfer-Encoding` extends ModeledCompanion[`Transfer-Encoding`] {
   def apply(first: TransferEncoding, more: TransferEncoding*): `Transfer-Encoding` = apply(immutable.Seq(first +: more: _*))
diff --git a/akka-http-core/src/test/scala/akka/http/impl/engine/client/TlsEndpointVerificationSpec.scala b/akka-http-core/src/test/scala/akka/http/impl/engine/client/TlsEndpointVerificationSpec.scala
index bbe90e9eac..0948a75c05 100644
--- a/akka-http-core/src/test/scala/akka/http/impl/engine/client/TlsEndpointVerificationSpec.scala
+++ b/akka-http-core/src/test/scala/akka/http/impl/engine/client/TlsEndpointVerificationSpec.scala
@@ -13,17 +13,15 @@ import akka.stream.testkit.AkkaSpec
 import akka.http.impl.util._
 import akka.http.scaladsl.{ HttpsContext, Http }
 import akka.http.scaladsl.model.{ StatusCodes, HttpResponse, HttpRequest }
-import akka.http.scaladsl.model.headers.Host
+import akka.http.scaladsl.model.headers.{ Host, `Tls-Session-Info` }
 import org.scalatest.time.{ Span, Seconds }
 import scala.concurrent.Future
-import akka.testkit.EventFilter
-import javax.net.ssl.SSLException
 
 class TlsEndpointVerificationSpec extends AkkaSpec("""
     akka.loglevel = INFO
     akka.io.tcp.trace-logging = off
+    akka.http.parsing.tls-session-info-header = on
   """) with ScalaFutures {
-
   implicit val materializer = ActorMaterializer()
 
   /*
@@ -47,6 +45,8 @@ class TlsEndpointVerificationSpec extends AkkaSpec("""
 
       whenReady(pipe(HttpRequest(uri = "https://akka.example.org:8080/")), timeout) { response ⇒
         response.status shouldEqual StatusCodes.OK
+        val tlsInfo = response.header[`Tls-Session-Info`].get
+        tlsInfo.peerPrincipal.get.getName shouldEqual "CN=akka.example.org,O=Internet Widgits Pty Ltd,ST=Some-State,C=AU"
       }
     }
     "not accept certificates for foreign hosts" in {
@@ -96,7 +96,12 @@ class TlsEndpointVerificationSpec extends AkkaSpec("""
     Source.single(req).via(pipelineFlow(clientContext, hostname)).runWith(Sink.head)
 
   def pipelineFlow(clientContext: HttpsContext, hostname: String): Flow[HttpRequest, HttpResponse, Unit] = {
-    val handler: HttpRequest ⇒ HttpResponse = _ ⇒ HttpResponse()
+    val handler: HttpRequest ⇒ HttpResponse = { req ⇒
+      // verify Tls-Session-Info header information
+      val name = req.header[`Tls-Session-Info`].flatMap(_.localPrincipal).map(_.getName)
+      if (name.exists(_ == "CN=akka.example.org,O=Internet Widgits Pty Ltd,ST=Some-State,C=AU")) HttpResponse()
+      else HttpResponse(StatusCodes.BadRequest, entity = "Tls-Session-Info header verification failed")
+    }
 
     val serverSideTls = Http().sslTlsStage(Some(ExampleHttpContexts.exampleServerContext), Server)
     val clientSideTls = Http().sslTlsStage(Some(clientContext), Client, Some(hostname -> 8080))
diff --git a/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/RequestParserSpec.scala b/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/RequestParserSpec.scala
index 631fc039af..e90494bc3a 100644
--- a/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/RequestParserSpec.scala
+++ b/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/RequestParserSpec.scala
@@ -4,13 +4,23 @@
 
 package akka.http.impl.engine.parsing
 
-import akka.stream.impl.fusing.GraphInterpreter
-import com.typesafe.config.{ Config, ConfigFactory }
 import scala.concurrent.Future
 import scala.concurrent.duration._
+
+import com.typesafe.config.{ Config, ConfigFactory }
+
+import akka.util.ByteString
+
+import akka.actor.ActorSystem
+
+import akka.stream.ActorMaterializer
+import akka.stream.scaladsl._
+
+import akka.stream.io.{ SslTlsPlacebo, SessionBytes }
+
 import org.scalatest.matchers.Matcher
 import org.scalatest.{ BeforeAndAfterAll, FreeSpec, Matchers }
-import akka.actor.ActorSystem
+
 import akka.http.ParserSettings
 import akka.http.impl.engine.parsing.ParserOutput._
 import akka.http.impl.util._
@@ -24,9 +34,6 @@ import akka.http.scaladsl.model._
 import akka.http.scaladsl.model.headers._
 import akka.http.scaladsl.util.FastFuture
 import akka.http.scaladsl.util.FastFuture._
-import akka.stream.{ OverflowStrategy, ActorMaterializer }
-import akka.stream.scaladsl._
-import akka.util.ByteString
 
 class RequestParserSpec extends FreeSpec with Matchers with BeforeAndAfterAll {
   val testConf: Config = ConfigFactory.parseString("""
@@ -233,10 +240,10 @@ class RequestParserSpec extends FreeSpec with Matchers with BeforeAndAfterAll {
       }
 
       "don't overflow the stack for large buffers of chunks" in new Test {
-        override val awaitAtMost = 3000.millis
+        override val awaitAtMost = 10000.millis
 
         val x = NotEnoughDataException
-        val numChunks = 15000 // failed starting from 4000 with sbt started with `-Xss2m`
+        val numChunks = 12000 // failed starting from 4000 with sbt started with `-Xss2m`
         val oneChunk = "1\r\nz\n"
         val manyChunks = (oneChunk * numChunks) + "0\r\n"
 
@@ -473,7 +480,7 @@ class RequestParserSpec extends FreeSpec with Matchers with BeforeAndAfterAll {
 
     def multiParse(parser: HttpRequestParser)(input: Seq[String]): Seq[Either[RequestOutput, StrictEqualHttpRequest]] =
       Source(input.toList)
-        .map(ByteString.apply)
+        .map(bytes ⇒ SessionBytes(SslTlsPlacebo.dummySession, ByteString(bytes)))
         .transform(() ⇒ parser.stage).named("parser")
         .splitWhen(x ⇒ x.isInstanceOf[MessageStart] || x.isInstanceOf[EntityStreamError])
         .prefixAndTail(1)
diff --git a/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/ResponseParserSpec.scala b/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/ResponseParserSpec.scala
index 29a4aeab2c..00f46b4b75 100644
--- a/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/ResponseParserSpec.scala
+++ b/akka-http-core/src/test/scala/akka/http/impl/engine/parsing/ResponseParserSpec.scala
@@ -6,6 +6,7 @@ package akka.http.impl.engine.parsing
 
 import akka.http.ParserSettings
 import akka.http.scaladsl.util.FastFuture
+import akka.stream.io.{ SslTlsPlacebo, SessionBytes }
 import com.typesafe.config.{ ConfigFactory, Config }
 import scala.concurrent.{ Future, Await }
 import scala.concurrent.duration._
@@ -290,7 +291,7 @@ class ResponseParserSpec extends FreeSpec with Matchers with BeforeAndAfterAll {
 
     def rawParse(requestMethod: HttpMethod, input: String*): Source[Either[ResponseOutput, HttpResponse], Unit] =
       Source(input.toList)
-        .map(ByteString.apply)
+        .map(bytes ⇒ SessionBytes(SslTlsPlacebo.dummySession, ByteString(bytes)))
         .transform(() ⇒ newParserStage(requestMethod)).named("parser")
         .splitWhen(x ⇒ x.isInstanceOf[MessageStart] || x.isInstanceOf[EntityStreamError])
         .prefixAndTail(1)
diff --git a/akka-stream/src/main/scala/akka/stream/io/SslTls.scala b/akka-stream/src/main/scala/akka/stream/io/SslTls.scala
index 35dbfd483f..04ec83a536 100644
--- a/akka-stream/src/main/scala/akka/stream/io/SslTls.scala
+++ b/akka-stream/src/main/scala/akka/stream/io/SslTls.scala
@@ -4,6 +4,7 @@
 package akka.stream.io
 
 import java.lang.{ Integer ⇒ jInteger }
+import java.security.Principal
 
 import akka.japi
 import akka.stream._
@@ -152,18 +153,63 @@ object SslTls {
  * unwrapping [[SendBytes]].
  */
 object SslTlsPlacebo {
+  // this constructs a session for (invalid) protocol SSL_NULL_WITH_NULL_NULL
+  private[akka] val dummySession = SSLContext.getDefault.createSSLEngine.getSession
+
   val forScala: scaladsl.BidiFlow[SslTlsOutbound, ByteString, ByteString, SessionBytes, Unit] =
     scaladsl.BidiFlow.fromGraph(scaladsl.GraphDSL.create() { implicit b ⇒
-      // this constructs a session for (invalid) protocol SSL_NULL_WITH_NULL_NULL
-      val session = SSLContext.getDefault.createSSLEngine.getSession
       val top = b.add(scaladsl.Flow[SslTlsOutbound].collect { case SendBytes(bytes) ⇒ bytes })
-      val bottom = b.add(scaladsl.Flow[ByteString].map(SessionBytes(session, _)))
+      val bottom = b.add(scaladsl.Flow[ByteString].map(SessionBytes(dummySession, _)))
       BidiShape.fromFlows(top, bottom)
     })
   val forJava: javadsl.BidiFlow[SslTlsOutbound, ByteString, ByteString, SessionBytes, Unit] =
     new javadsl.BidiFlow(forScala)
 }
 
+import java.security.Principal
+import java.security.cert.Certificate
+import javax.net.ssl.{ SSLPeerUnverifiedException, SSLSession }
+
+/** Allows access to an SSLSession with Scala types */
+trait ScalaSessionAPI {
+  def session: SSLSession
+
+  /**
+   * Scala API: Extract the certificates that were actually used by this
+   * engine during this session’s negotiation. The list is empty if no
+   * certificates were used.
+   */
+  def localCertificates: List[Certificate] = Option(session.getLocalCertificates).map(_.toList).getOrElse(Nil)
+  /**
+   * Scala API: Extract the Principal that was actually used by this engine
+   * during this session’s negotiation.
+   */
+  def localPrincipal: Option[Principal] = Option(session.getLocalPrincipal)
+  /**
+   * Scala API: Extract the certificates that were used by the peer engine
+   * during this session’s negotiation. The list is empty if no certificates
+   * were used.
+   */
+  def peerCertificates: List[Certificate] =
+    try Option(session.getPeerCertificates).map(_.toList).getOrElse(Nil)
+    catch { case e: SSLPeerUnverifiedException ⇒ Nil }
+  /**
+   * Scala API: Extract the Principal that the peer engine presented during
+   * this session’s negotiation.
+   */
+  def peerPrincipal: Option[Principal] =
+    try Option(session.getPeerPrincipal)
+    catch { case e: SSLPeerUnverifiedException ⇒ None }
+}
+
+object ScalaSessionAPI {
+  /** Constructs a ScalaSessionAPI instance from an SSLSession */
+  def apply(_session: SSLSession): ScalaSessionAPI =
+    new ScalaSessionAPI {
+      def session: SSLSession = _session
+    }
+}
+
 /**
  * Many protocols are asymmetric and distinguish between the client and the
  * server, where the latter listens passively for messages and the former
@@ -313,34 +359,7 @@ case object SessionTruncated extends SessionTruncated
  * The Java API for getting session information is given by the SSLSession object,
  * the Scala API adapters are offered below.
  */
-case class SessionBytes(session: SSLSession, bytes: ByteString) extends SslTlsInbound {
-  /**
-   * Scala API: Extract the certificates that were actually used by this
-   * engine during this session’s negotiation. The list is empty if no
-   * certificates were used.
-   */
-  def localCertificates: List[Certificate] = Option(session.getLocalCertificates).map(_.toList).getOrElse(Nil)
-  /**
-   * Scala API: Extract the Principal that was actually used by this engine
-   * during this session’s negotiation.
-   */
-  def localPrincipal = Option(session.getLocalPrincipal)
-  /**
-   * Scala API: Extract the certificates that were used by the peer engine
-   * during this session’s negotiation. The list is empty if no certificates
-   * were used.
-   */
-  def peerCertificates =
-    try Option(session.getPeerCertificates).map(_.toList).getOrElse(Nil)
-    catch { case e: SSLPeerUnverifiedException ⇒ Nil }
-  /**
-   * Scala API: Extract the Principal that the peer engine presented during
-   * this session’s negotiation.
-   */
-  def peerPrincipal =
-    try Option(session.getPeerPrincipal)
-    catch { case e: SSLPeerUnverifiedException ⇒ None }
-}
+case class SessionBytes(session: SSLSession, bytes: ByteString) extends SslTlsInbound with ScalaSessionAPI
 
 /**
  * This is the supertype of all messages that the SslTls stage accepts on its