Refresh dependencies and fix tests.

util/http.py

@@ -1,8 +1,10 @@
 import logging
 import json
 
+from flask import request, make_response, current_app
+from werkzeug.exceptions import HTTPException
+
 from app import analytics
-from flask import request, abort as flask_abort, make_response, current_app
 from auth.auth_context import get_authenticated_user, get_validated_token
 
 logger = logging.getLogger(__name__)
@@ -28,7 +30,11 @@ def _abort(status_code, data_object, headers):
   resp = make_response(json.dumps(data_object), status_code, headers)
 
   # Report the abort to the user.
-  flask_abort(resp)
+  # Raising HTTPException as workaround for https://github.com/pallets/werkzeug/issues/1098
+  new_exception = HTTPException(response=resp)
+  new_exception.code = status_code
+  raise new_exception
+
 
 def exact_abort(status_code, message=None):
   data = {}
@@ -38,6 +44,7 @@ def exact_abort(status_code, message=None):
 
   _abort(status_code, data, {})
 
+
 def abort(status_code, message=None, issue=None, headers=None, **kwargs):
 
   message = (str(message) % kwargs if message else