Shouldn't drop etag

index.js

@@ -7,10 +7,9 @@ const understoodStatuses = [200, 203, 204, 300, 301, 302, 303, 307, 308, 404, 40
 
 const hopByHopHeaders = {'connection':true, 'keep-alive':true, 'proxy-authenticate':true, 'proxy-authorization':true, 'te':true, 'trailer':true, 'transfer-encoding':true, 'upgrade':true};
 const excludedFromRevalidationUpdate = {
-    'etag': true, 'last-modified': true, // Per spec
-    'content-range': true,
     // Since the old body is reused, it doesn't make sense to change properties of the body
     'content-length': true, 'content-encoding': true, 'transfer-encoding': true,
+    'content-range': true,
 };
 
 function parseCacheControl(header) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "http-cache-semantics",
-  "version": "3.6.0",
+  "version": "3.6.1",
   "description": "Parses Cache-Control and other headers. Helps building correct HTTP caches and proxies",
   "main": "index.js",
   "repository": "https://github.com/pornel/http-cache-semantics.git",

test/updatetest.js

@@ -40,6 +40,7 @@ function assertUpdates(firstRequest, firstResponse, secondRequest, secondRespons
     assert.equal(headers['foo'], 'updated');
     assert.equal(headers['x-other'], 'original');
     assert.strictEqual(headers['x-ignore-new'], undefined);
+    assert.strictEqual(headers['etag'], secondResponse.headers.etag);
 }
 
 describe('Update revalidated', function() {