From b9352f8ad2c8f9269c355a6f85cfad2b35cccadf Mon Sep 17 00:00:00 2001
From: David Wolever <david@wolever.net>
Date: Fri, 17 May 2013 00:11:22 -0400
Subject: [PATCH] Set Accept-Range header, return 406 on invalid range

---
 tornado/web.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tornado/web.py b/tornado/web.py
index b41c08c3f..9e5135255 100644
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -1754,10 +1754,15 @@ class StaticFileHandler(RequestHandler):
                 self.set_status(304)
                 return
 
+        self.set_header("Accept-Ranges", "bytes")
         request_range = None
         range_header = self.request.headers.get("Range")
         if range_header:
             request_range = httputil.parse_request_range(range_header)
+            if not request_range:
+                # 406: Not Acceptable
+                self.set_status(406)
+                return
 
         with open(abspath, "rb") as file:
             data = file.read()
-- 
2.47.2