--- a/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/internal/frame/FramesDecoder.java	Mon Feb 05 15:51:09 2018 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/internal/frame/FramesDecoder.java	Mon Feb 05 17:18:26 2018 +0000
@@ -281,7 +281,8 @@
             int extract = Math.min(remaining, bytecount);
             ByteBuffer extractedBuf;
             if (isDataFrame) {
-                extractedBuf = Utils.sliceWithLimitedCapacity(currentBuffer, extract);
+                extractedBuf = Utils.sliceWithLimitedCapacity(currentBuffer, extract)
+                                    .asReadOnlyBuffer();
                 slicedToDataFrame = true;
             } else {
                 // Header frames here