diff --git a/jetty-client/src/main/java/org/eclipse/jetty/client/http/HttpReceiverOverHTTP.java b/jetty-client/src/main/java/org/eclipse/jetty/client/http/HttpReceiverOverHTTP.java
index 9dae09c1d51d..c06a609a6977 100644
--- a/jetty-client/src/main/java/org/eclipse/jetty/client/http/HttpReceiverOverHTTP.java
+++ b/jetty-client/src/main/java/org/eclipse/jetty/client/http/HttpReceiverOverHTTP.java
@@ -47,6 +47,7 @@ public class HttpReceiverOverHTTP extends HttpReceiver implements HttpParser.Res
     private boolean shutdown;
     private boolean complete;
     private boolean unsolicited;
+    private int status;
 
     public HttpReceiverOverHTTP(HttpChannelOverHTTP channel)
     {
@@ -118,15 +119,17 @@ private void releaseNetworkBuffer()
 
     protected ByteBuffer onUpgradeFrom()
     {
+        ByteBuffer upgradeBuffer = null;
         if (networkBuffer.hasRemaining())
         {
-            ByteBuffer upgradeBuffer = BufferUtil.allocate(networkBuffer.remaining());
+            upgradeBuffer = BufferUtil.allocate(networkBuffer.remaining());
             BufferUtil.clearToFill(upgradeBuffer);
             BufferUtil.put(networkBuffer.getBuffer(), upgradeBuffer);
             BufferUtil.flipToFlush(upgradeBuffer, 0);
-            return upgradeBuffer;
         }
-        return null;
+
+        releaseNetworkBuffer();
+        return upgradeBuffer;
     }
 
     private void process()
@@ -145,12 +148,11 @@ private void process()
                     return;
                 }
 
-                // Connection may be closed or upgraded in a parser callback.
-                boolean upgraded = connection != endPoint.getConnection();
-                if (connection.isClosed() || upgraded)
+                // Connection may be closed in a parser callback.
+                if (connection.isClosed())
                 {
                     if (LOG.isDebugEnabled())
-                        LOG.debug("{} {}", upgraded ? "Upgraded" : "Closed", connection);
+                        LOG.debug("Closed {}", connection);
                     releaseNetworkBuffer();
                     return;
                 }
@@ -215,6 +217,14 @@ private boolean parse()
             if (LOG.isDebugEnabled())
                 LOG.debug("Parse complete={}, remaining {} {}", complete, networkBuffer.remaining(), parser);
 
+            if (complete)
+            {
+                int status = this.status;
+                this.status = 0;
+                if (status == HttpStatus.SWITCHING_PROTOCOLS_101)
+                    return true;
+            }
+
             if (networkBuffer.isEmpty())
                 return false;
 
@@ -269,6 +279,7 @@ public boolean startResponse(HttpVersion version, int status, String reason)
         if (exchange == null)
             return false;
 
+        this.status = status;
         String method = exchange.getRequest().getMethod();
         parser.setHeadResponse(HttpMethod.HEAD.is(method) ||
             (HttpMethod.CONNECT.is(method) && status == HttpStatus.OK_200));