From 3cd9bf2b0495a69e637d3e02a6f63a5b4eb0ad14 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 24 May 2017 17:06:40 +0530
Subject: [PATCH] ...

---
 src/calibre/srv/cdb.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/calibre/srv/cdb.py b/src/calibre/srv/cdb.py
index 2a02193bbb..708c854742 100644
--- a/src/calibre/srv/cdb.py
+++ b/src/calibre/srv/cdb.py
@@ -36,8 +36,10 @@ def cdb_run(ctx, rd, which, version):
     try:
         if MSGPACK_MIME in ct:
             args = msgpack_loads(raw)
-        else:
+        elif 'application/json' in ct:
             args = json_loads(raw)
+        else:
+            raise HTTPBadRequest('Only JSON or msgpack requests are supported')
     except Exception:
         raise HTTPBadRequest('args are not valid encoded data')
     if getattr(m, 'needs_srv_ctx', False):