It's a way to link, or "hook" to a web based service. You provide a URL where you want to receive event information, and when an event happens the server will HTTP POST the relevant information to the URL. This way, you don't have to constantly poll the service asking "did an event happen yet?"; the server will notify you automatically.
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It's a way to link, or "hook" to a web based service. You provide a URL where you want to receive event information, and when an event happens the server will HTTP POST the relevant information to the URL. This way, you don't have to constantly poll the service asking "did an event happen yet?"; the server will notify you automatically.