code: @Test public void testSerialization() throws Exception {
    HttpVersion orig=HttpVersion.HTTP_1_1;
    ByteArrayOutputStream outbuffer=new ByteArrayOutputStream();
    ObjectOutputStream outstream=new ObjectOutputStream(outbuffer);
    outstream.writeObject(orig);
    outstream.close();
    byte[] raw=outbuffer.toByteArray();
    ByteArrayInputStream inbuffer=new ByteArrayInputStream(raw);
    ObjectInputStream instream=new ObjectInputStream(inbuffer);
    HttpVersion clone=(HttpVersion)instream.readObject();
    Assert.assertEquals(orig,clone);
  }
  