From 6a295ac196bcaa0e8c8a649fd668e8bab2d9ea25 Mon Sep 17 00:00:00 2001
From: Alex Kocharin <alex@kocharin.ru>
Date: Fri, 6 Dec 2013 21:46:11 +0400
Subject: [PATCH] don't send etags with errors

---
 lib/middleware.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/middleware.js b/lib/middleware.js
index d36b601ca..5955685db 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -110,7 +110,10 @@ module.exports.log_and_etagify = function(req, res, next) {
 				body = JSON.stringify(body, undefined, '\t')
 			}
 
-			res.header('ETag', '"' + md5sum(body) + '"')
+			// don't send etags with errors
+			if (!res.statusCode || (res.statusCode >= 200 && res.statusCode < 300)) {
+				res.header('ETag', '"' + md5sum(body) + '"')
+			}
 		} else {
 			// send(null), send(204), etc.
 		}