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- c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
- SPDX-License-Identifier: curl
- Long: http2
- Tags: Versions
- Protocols: HTTP
- Added: 7.33.0
- Mutexed: http1.1 http1.0 http2-prior-knowledge http3
- Requires: HTTP/2
- Help: Use HTTP/2
- See-also: http1.1 http3 no-alpn
- Category: http
- Example: --http2 $URL
- Multi: mutex
- ---
- Tells curl to use HTTP version 2.
- For HTTPS, this means curl negotiates HTTP/2 in the TLS handshake. curl does
- this by default.
- For HTTP, this means curl attempts to upgrade the request to HTTP/2 using the
- Upgrade: request header.
- When curl uses HTTP/2 over HTTPS, it does not itself insist on TLS 1.2 or
- higher even though that is required by the specification. A user can add this
- version requirement with --tlsv1.2.
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