ALPN stands for Application-Layer Protocol Negotiation. It’s a Transport Layer Security (TLS) extension that aids client and server identification during secure data transfers. ALPN is an automated standard for how servers talk to each other — ALPN works in the early stages of a TLS handshake to help parties immediately identify each other and agree on protocols to avoid backtracking later.

ALPN is more secure and efficient than older negotiation methods, like lower-security Next Protocol Negotiation. It also optimizes updated protocols such as HTTP/2, which aids load time and encryption more than HTTP/1 can. 

ALPN is an ideal feature for web hosting services because it streamlines data transfers and increases website security. Webflow’s host supports HTTP/2 protocol and uses TLS 1.3 as of 2022.

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