In jst_server, fix bugs and implement streaming

diff --git a/jst_server b/jst_server
index a5523d4..e3e0da2 160000 (submodule)
--- a/jst_server
+++ b/jst_server
@@ -1 +1 @@
-Subproject commit a5523d4e602cf57010e5e7e8fd18f149f1aa1999
+Subproject commit e3e0da29a2bf97954d17595a8bec40401afd8cd6