WebSocket
[Announcing Websocket availability with Amazon API Gateway | Amazon Web Services Blog https://aws.amazon.com/jp/blogs/news/announcing-websocket-apis-in-amazon- api-gateway/]
I was thinking, "I shouldn't put this in Firestore because I need to share cursors and other low-latency, high-frequency information sharing, and I'd have to create a WebSocket relay server, which is a hassle. I looked it up and found that Amazon API Gateway can do it.
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This page is auto-translated from /nishio/WebSocket. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I'm very happy to spread my thought to non-Japanese readers.