A request for a mashup widget having multiple versions from an identifiable source can be identified. A data store can be queried to determine if a previous request for the mashup widget was made by the identifiable source. When the previous request exists, a version of the mashup widget used to handle the previous request can be automatically determined. The determined version can be one of many versions of the mashup widget. The determined version of the mashup widget can be used to generate a response to the request. When the previous request is not found when querying the data store, one of the mashup versions that is to be used can be determined based upon a programmatic rule. Historical data regarding widget version use can be saved in the data store and used to determine which widget version is to be selected to handle future requests.