From 881ce8f83485558994c0b6b58ae93317ba0bf8c5 Mon Sep 17 00:00:00 2001
From: Tristan Sloughter <t@crashfast.com>
Date: Wed, 12 Sep 2018 14:57:13 -0600
Subject: [PATCH] quote etag in header sent to hex_core

---
 src/rebar_pkg_resource.erl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/rebar_pkg_resource.erl b/src/rebar_pkg_resource.erl
index cfbe460f..51a63a53 100644
--- a/src/rebar_pkg_resource.erl
+++ b/src/rebar_pkg_resource.erl
@@ -134,8 +134,8 @@ make_vsn(_, _) ->
 %%------------------------------------------------------------------------------
 -spec request(rebar_hex_repos:repo(), binary(), binary(), false | binary())
              -> {ok, cached} | {ok, binary(), binary()} | error.
-request(Config, Name, Version, ETag) ->    
-    Config1 = Config#{http_etag => ETag},
+request(Config, Name, Version, ETag) ->
+    Config1 = Config#{http_etag => <<"\"", ETag/binary, "\"">>},
     try hex_repo:get_tarball(Config1, Name, Version) of
         {ok, {200, #{<<"etag">> := ETag1}, Tarball}} ->
             {ok, Tarball, rebar_utils:to_binary(rebar_string:trim(rebar_utils:to_list(ETag1), both, [$"]))};