1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Long: http2 5Tags: Versions 6Protocols: HTTP 7Added: 7.33.0 8Mutexed: http1.1 http1.0 http2-prior-knowledge http3 9Requires: HTTP/2 10Help: Use HTTP/2 11Category: http 12Multi: mutex 13See-also: 14 - http1.1 15 - http3 16 - no-alpn 17Example: 18 - --http2 $URL 19--- 20 21# `--http2` 22 23Use HTTP/2. 24 25For HTTPS, this means curl negotiates HTTP/2 in the TLS handshake. curl does 26this by default. 27 28For HTTP, this means curl attempts to upgrade the request to HTTP/2 using the 29Upgrade: request header. 30 31When curl uses HTTP/2 over HTTPS, it does not itself insist on TLS 1.2 or 32higher even though that is required by the specification. A user can add this 33version requirement with --tlsv1.2. 34
