Google Visualization API supports multiple data queries. So on the client side if you use
google.visualization.Query, it automatically increases
reqId with every new request you make on the same page. The reason is to identify query responses correctly using
In order to make this work, you also have to prepare your query responses with the correct
reqId. You can use the following snippet if you are using gviz python library. However the idea is simple extract
reqId from request and include it in your response accordingly.