HTTP, in its essence, is just rules agreed by concerned orgs and people. Now, rules change for betterment, so did HTTP rules over the time, and there are several HTTP versions(HTTP 1.0, HTTP 1.1, HTTP 2 ...). These rules need to be implemented by both clients(browsers) and servers(apache, nginx) to be fully functional (e.g. if server respond with HTTP 2 response but browser didn't implement HTTP 2 it won't work). HTTP 2 is a major release which defines new rules and it's completely different from HTTP 1.X but it has yet to be as popular/supported as HTTP1.X.
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What are these new versions of http like http2 and how these are different from http
HTTP, in its essence, is just rules agreed by concerned orgs and people. Now, rules change for betterment, so did HTTP rules over the time, and there are several HTTP versions(HTTP 1.0, HTTP 1.1, HTTP 2 ...). These rules need to be implemented by both clients(browsers) and servers(apache, nginx) to be fully functional (e.g. if server respond with HTTP 2 response but browser didn't implement HTTP 2 it won't work). HTTP 2 is a major release which defines new rules and it's completely different from HTTP 1.X but it has yet to be as popular/supported as HTTP1.X.