ec: Don't copy EC metadata to replicated objects

Change-Id: Ia6c1b75a24d2b46720d7a3b6e3a126444a38be0e
Closes-Bug: #1885857

swift/proxy/controllers/obj.py

@@ -3085,6 +3085,12 @@ def _fix_response(self, req, resp):
         if resp.status_int == HTTP_REQUESTED_RANGE_NOT_SATISFIABLE:
             resp.headers['Content-Range'] = 'bytes */%s' % resp.headers[
                 'X-Object-Sysmeta-Ec-Content-Length']
+        ec_headers = [header for header in resp.headers
+                      if header.lower().startswith('x-object-sysmeta-ec-')]
+        for header in ec_headers:
+            # clients (including middlewares) shouldn't need to care about
+            # this implementation detail
+            del resp.headers[header]
 
     def _fix_ranges(self, req, resp):
         # Has to be called *before* kickoff()!

test/unit/proxy/controllers/test_obj.py

@@ -2307,12 +2307,17 @@ def _test_one_handoff(index):
     def test_GET_simple(self):
         req = swift.common.swob.Request.blank('/v1/a/c/o')
         get_statuses = [200] * self.policy.ec_ndata
-        get_hdrs = [{'Connection': 'close'}] * self.policy.ec_ndata
+        get_hdrs = [{
+            'Connection': 'close',
+            'X-Object-Sysmeta-Ec-Scheme': self.policy.ec_scheme_description,
+        }] * self.policy.ec_ndata
         with set_http_connect(*get_statuses, headers=get_hdrs):
             resp = req.get_response(self.app)
         self.assertEqual(resp.status_int, 200)
         self.assertIn('Accept-Ranges', resp.headers)
         self.assertNotIn('Connection', resp.headers)
+        self.assertFalse([h for h in resp.headers
+                          if h.lower().startswith('x-object-sysmeta-ec-')])
 
     def test_GET_not_found_when_404_newer(self):
         # if proxy receives a 404, it keeps waiting for other connections until