From 7466ee25a8d94017735a0380fc232fd8ec472421 Mon Sep 17 00:00:00 2001
From: Itamar Turner-Trauring <itamar@itamarst.org>
Date: Thu, 10 Feb 2022 13:57:57 -0500
Subject: [PATCH] Don't send header if it makes no sense to do so.

---
 src/allmydata/storage/http_server.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/allmydata/storage/http_server.py b/src/allmydata/storage/http_server.py
index 491fcd39b..f89a156a3 100644
--- a/src/allmydata/storage/http_server.py
+++ b/src/allmydata/storage/http_server.py
@@ -329,8 +329,11 @@ class HTTPServer(object):
         data = bucket.read(offset, end - offset)
 
         request.setResponseCode(http.PARTIAL_CONTENT)
-        request.setHeader(
-            "content-range",
-            ContentRange("bytes", offset, offset + len(data)).to_header(),
-        )
+        if len(data):
+            # For empty bodies the content-range header makes no sense since
+            # the end of the range is inclusive.
+            request.setHeader(
+                "content-range",
+                ContentRange("bytes", offset, offset + len(data)).to_header(),
+            )
         return data