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I think this is the wrong message. When developers hear that WebSockets are going to land in the near future in Rails they get all giddy with excitement.
If WebSockets get us there, great, but it is an implementation detail that comes at high cost. Do we really need ultra high performance, full duplex Client-Server communication? WebSockets provides simple APIs to broadcast information to clients and simple APIs to ship information from the clients to the web server.
A realtime channel to send information from the server to the client is very welcome. In fact it is a part of HTTP 1. However, a brand new API for shipping information to the server from web browsers introduce a new decision point for developers: If I use the new backchannel, how do I debug it?
How do I log what is going on? How do I profile it?
How do I ensure it does not slow down other traffic to my site? Do I also expose this endpoint in a controller action? How do I rate limit this? How do I ensure my background WebSocket thread does not exhaust my db connection limit?
If an API allows hundreds of different connections concurrent access to the database, bad stuff will happen. Introducing this backchannel is not a clear win and comes with many caveats. I do not think the majority of web applications need a new backchannel into the web server.
On a technical level you would opt for such a construct if you were managing 10k interactive console sessions on the web. You can transport data more efficiently to the server, in that the web server no longer needs to parse HTTP headers, Rails does not need to do a middleware crawl and so on.
But the majority of web applications out there are predominantly read applications. Lots of users benefit from live updates, but very few change information. It is incredibly rare to be in a situation where the HTTP header parsing optimisation is warranted; this work is done sub millisecond.
Bypassing Rack middleware on the other hand can be significant, especially when full stack middleware crawls are a ms affair.
That however is an implementation detail we can optimise and not a reason to rule out REST for client to server communications.Professional level writing is the service which is the best for the candidates having more than 2 years of experience but not occupying an executive level position.
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