An HTTP source is an application that Celigo sync can connect to over HTTP and read using object mode, discovering the application's objects and metadata for you instead of requiring you to build an export first. This article lists every HTTP source available today; select a connector to open its setup article, which covers the available objects, API endpoints, extract modes, and delta fields for that application. If your application isn't listed here, you can still sync it using export mode — see Create a sync from an application's exports.