Chrome requires the :version: header in SPDY_SESSION_PUSHED_SYN_STREAM frames otherwise it issues a HTTP_TRANSACTION_SPDY_SEND_REQUEST_HEADERS and a SPDY_STREAM_ERROR saying "HEADERS incomplete headers, but pending data frames."

Ported from 3

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdyHttpEncoder.java

@@ -249,6 +249,7 @@ public class SpdyHttpEncoder extends MessageToMessageEncoder<Object> {
             HttpResponse httpResponse = (HttpResponse) httpMessage;
             SpdyHeaders.setStatus(spdyVersion, spdySynStreamFrame, httpResponse.getStatus());
             SpdyHeaders.setUrl(spdyVersion, spdySynStreamFrame, URL);
+            SpdyHeaders.setVersion(spdyVersion, spdySynStreamFrame, httpMessage.getProtocolVersion());
             spdySynStreamFrame.setUnidirectional(true);
         }