Serves all request that GET or POST form_data

        This endpoint evolved to be the entry point of many different
        requests that GETs or POSTs a form_data.

        `self.generate_json` receives this input and returns different
        payloads based on the request args in the first block

        TODO: break into one endpoint for each return shape

def explore_json(self, datasource_type=None, datasource_id=None):
        """Serves all request that GET or POST form_data

        This endpoint evolved to be the entry point of many different
        requests that GETs or POSTs a form_data.

        `self.generate_json` receives this input and returns different
        payloads based on the request args in the first block

        TODO: break into one endpoint for each return shape"""
        csv = request.args.get('csv') == 'true'
        query = request.args.get('query') == 'true'
        results = request.args.get('results') == 'true'
        samples = request.args.get('samples') == 'true'
        force = request.args.get('force') == 'true'

        form_data = get_form_data()[0]
        datasource_id, datasource_type = get_datasource_info(
            datasource_id, datasource_type, form_data)
        viz_obj = get_viz(
            datasource_type=datasource_type,
            datasource_id=datasource_id,
            form_data=form_data,
            force=force,
        )

        return self.generate_json(
            viz_obj,
            csv=csv,
            query=query,
            results=results,
            samples=samples,
        )