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In many cases there's nothing frameworks need to do, it's just a matter of swapping out the HTTP server (e.x. https://github.com/expressjs/express/issues/2364#i
by tlrobinson 8y ago
In many cases there's nothing frameworks need to do, it's just a matter of swapping out the HTTP server (e.x. https://github.com/expressjs/express/issues/2364#issuecomment-56064232 https://github.com/expressjs/express/issues/2364#issuecommen...) or maybe even just sticking an HTTP/2-compatible reverse proxy close to the app servers.
Now, if you want to take advantage of HTTP/2 features like server push that's another story.