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Background processing of the queued messages starts from("gtask://default"). The first step is to enrich the previously generated ReportData object with data from the Google weather service. The service URL is dynamically constructed by setting the Exchange.HTTP_QUERY header to weather=<city>. For example, if the user entered London in the city field of the form the resulting URL is ghttp://www.google.com/ig/api?weather=London. The weather service is accessed with the ghttp component and the weather service response is aggregated into the ReportData object using a custom aggregator returned by the reportDataAggregator() method. Generating a simple weather report from ReportData is done by the ReportGenerator. The report is then sent by email with the gmail component.