From c5c365220ed2c867fe81078f70b827de22db2ee6 Mon Sep 17 00:00:00 2001
From: 180909 <734461790@qq.com>
Date: Tue, 7 Dec 2021 08:10:49 +0800
Subject: bpo-28953: Use `raise from` when raising new IncompleteRead
 (GH-29861)

Automerge-Triggered-By: GH:asvetlov
---
 Lib/http/client.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Lib/http/client.py b/Lib/http/client.py
index a6ab135..f54172f 100644
--- a/Lib/http/client.py
+++ b/Lib/http/client.py
@@ -593,8 +593,8 @@ class HTTPResponse(io.BufferedIOBase):
                     amt -= chunk_left
                 self.chunk_left = 0
             return b''.join(value)
-        except IncompleteRead:
-            raise IncompleteRead(b''.join(value))
+        except IncompleteRead as exc:
+            raise IncompleteRead(b''.join(value)) from exc
 
     def _readinto_chunked(self, b):
         assert self.chunked != _UNKNOWN
-- 
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