From b6123eede65f870061c5440027b0af5ced826ffe Mon Sep 17 00:00:00 2001
From: Maximilian Hils <git@maximilianhils.com>
Date: Fri, 25 May 2018 13:22:52 +0200
Subject: minor changes to stay in sync with sans-io

---
 mitmproxy/proxy/protocol/http.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mitmproxy/proxy/protocol/http.py b/mitmproxy/proxy/protocol/http.py
index 66390e15..2ae656b3 100644
--- a/mitmproxy/proxy/protocol/http.py
+++ b/mitmproxy/proxy/protocol/http.py
@@ -291,7 +291,7 @@ class HttpLayer(base.Layer):
             self.channel.ask("error", f)
             raise exceptions.ProtocolException(
                 "HTTP protocol error in client request: {}".format(e)
-            )
+            ) from e
 
         self.log("request", "debug", [repr(request)])
 
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