diff --git a/endpoints/registry.py b/endpoints/registry.py
index 76c7d56cd..b8f3dffe2 100644
--- a/endpoints/registry.py
+++ b/endpoints/registry.py
@@ -10,7 +10,7 @@ from time import time
 from app import storage as store, image_diff_queue
 from auth.auth import process_auth, extract_namespace_repo_from_session
 from util import checksums, changes
-from util.http import abort
+from util.http import abort, exact_abort
 from auth.permissions import (ReadRepositoryPermission,
                               ModifyRepositoryPermission)
 from data import model
@@ -158,7 +158,7 @@ def put_image_layer(namespace, repository, image_id):
 
   if (store.exists(layer_path) and not
       image_is_uploading(repo_image)):
-    abort(409, 'Image already exists', issue='image-exists', image_id=image_id)
+    exact_abort(409, 'Image already exists')
 
   profile.debug('Storing layer data')
 
@@ -301,11 +301,8 @@ def get_image_json(namespace, repository, image_id, headers):
     flask_abort(404)
 
   profile.debug('Looking up repo layer size')
-  try:
-    size = (repo_image.storage and repo_image.storage.image_size) or repo_image.image_size
-    headers['X-Docker-Size'] = str(size)
-  except OSError:
-    pass
+  size = (repo_image.storage and repo_image.storage.image_size) or repo_image.image_size
+  headers['X-Docker-Size'] = str(size)
 
   response = make_response(data, 200)
   response.headers.extend(headers)
@@ -423,7 +420,7 @@ def put_image_json(namespace, repository, image_id):
   profile.debug('Checking if image already exists')
   if (store.exists(json_path) and not
       image_is_uploading(repo_image)):
-    abort(409, 'Image already exists', issue='image-exists', image_id=image_id)
+    exact_abort(409, 'Image already exists')
 
   set_uploading_flag(repo_image, True)
 
diff --git a/util/http.py b/util/http.py
index 2ed21d8a5..30a8cd428 100644
--- a/util/http.py
+++ b/util/http.py
@@ -16,6 +16,28 @@ DEFAULT_MESSAGE[404] = 'Not Found'
 DEFAULT_MESSAGE[409] = 'Conflict'
 DEFAULT_MESSAGE[501] = 'Not Implemented'
 
+
+def _abort(status_code, data_object, headers):
+  # Add CORS headers to all errors
+  options_resp = current_app.make_default_options_response()
+  headers['Access-Control-Allow-Origin'] = '*'
+  headers['Access-Control-Allow-Methods'] = options_resp.headers['allow']
+  headers['Access-Control-Max-Age'] = str(21600)
+  headers['Access-Control-Allow-Headers'] = ['Authorization', 'Content-Type']
+
+  resp = make_response(json.dumps(data_object), status_code, headers)
+
+  # Report the abort to the user.
+  flask_abort(resp)
+
+def exact_abort(status_code, message=None):
+  data = {}
+
+  if message is not None:
+    data['error'] = message
+
+  _abort(status_code, data, {})
+
 def abort(status_code, message=None, issue=None, headers=None, **kwargs):
 
   message = (str(message) % kwargs if message else
@@ -57,14 +79,4 @@ def abort(status_code, message=None, issue=None, headers=None, **kwargs):
   if headers is None:
     headers = {}
 
-  # Add CORS headers to all errors
-  options_resp = current_app.make_default_options_response()
-  headers['Access-Control-Allow-Origin'] = '*'
-  headers['Access-Control-Allow-Methods'] = options_resp.headers['allow']
-  headers['Access-Control-Max-Age'] = str(21600)
-  headers['Access-Control-Allow-Headers'] = ['Authorization', 'Content-Type']
-
-  resp = make_response(json.dumps(data), status_code, headers)
-
-  # Report the abort to the user.
-  flask_abort(resp)
+  _abort(status_code, data, headers)