Merge a3007f6 into eb71152

kytos/core/api_server.py

@@ -15,6 +15,7 @@
 from flask import Flask, jsonify, request, send_file
 from flask_cors import CORS
 from flask_socketio import SocketIO, join_room, leave_room
+from werkzeug.exceptions import HTTPException
 
 
 class APIServer:
@@ -61,6 +62,22 @@ def __init__(self, app_name, listen='0.0.0.0', port=8181,
         # Update web-ui if necessary
         self.update_web_ui(force=False)
 
+        @self.app.errorhandler(HTTPException)
+        def handle_exception(e):
+            # pylint: disable=unused-variable, invalid-name
+            """Return a json for HTTP errors
+
+            This handler allows NApps to return HTTP error messages
+            by raising a HTTPException. When raising the Exception,
+            create it with a description.
+            """
+            response = jsonify({
+                'code': e.code,
+                'name': e.name,
+                'description': e.description
+            })
+            return response, e.code
+
     def _enable_websocket_rooms(self):
         socket = self.server
         socket.on_event('join', join_room)