From 68c57430daefd9a397c6c30d2168c4058409d74e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Mon, 6 Jun 2016 17:32:04 +0200
Subject: REST: If-Match uses strong Etag comparison

Weak Etag never matches.
---
 src/cowboy_rest.erl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cowboy_rest.erl b/src/cowboy_rest.erl
index 2401c04..d28c8e9 100644
--- a/src/cowboy_rest.erl
+++ b/src/cowboy_rest.erl
@@ -683,6 +683,9 @@ if_match_exists(Req, State) ->
 
 if_match(Req, State, EtagsList) ->
 	try generate_etag(Req, State) of
+		%% Strong Etag comparison: weak Etag never matches.
+		{{weak, _}, Req2, State2} ->
+			precondition_failed(Req2, State2);
 		{Etag, Req2, State2} ->
 			case lists:member(Etag, EtagsList) of
 				true -> if_unmodified_since_exists(Req2, State2);
-- 
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