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Gateways, Proxies, and more
You can find definitions of Gateway and Rewrite proxy on the specifications.
TL;DR:
- Gateway and rewrite proxies are used to translate application server protocol to push provider server protocol.
- Gateway is application specific: it translate the application protocol to a raw POST on a specific URL, without specific header.
- Rewrite proxy is provider specific: it translate the raw POST on a specific URL to the push provider server protocol.