From a2d70a7084d2209f957ff33d5315b10a13dde7e1 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Fri, 24 May 2019 19:01:04 -0700
Subject: [PATCH] fix: don't try to write an error _twice_.

The websocket upgrader does this for us.
---
 p2p/transport/websocket/listener.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/p2p/transport/websocket/listener.go b/p2p/transport/websocket/listener.go
index 437be9893f..517c719aac 100644
--- a/p2p/transport/websocket/listener.go
+++ b/p2p/transport/websocket/listener.go
@@ -26,7 +26,7 @@ func (l *listener) serve() {
 func (l *listener) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	c, err := upgrader.Upgrade(w, r, nil)
 	if err != nil {
-		http.Error(w, "Failed to upgrade websocket", 400)
+		// The upgrader writes a response for us.
 		return
 	}