30 lines
853 B
Markdown
30 lines
853 B
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Long: http2-prior-knowledge
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Tags: Versions
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Protocols: HTTP
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Added: 7.49.0
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Mutexed: http1.1 http1.0 http2 http3
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Requires: HTTP/2
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Help: Use HTTP 2 without HTTP/1.1 Upgrade
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Category: http
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Multi: boolean
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See-also:
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- http2
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- http3
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Example:
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- --http2-prior-knowledge $URL
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---
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# `--http2-prior-knowledge`
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Issue a non-TLS HTTP requests using HTTP/2 directly without HTTP/1.1 Upgrade.
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It requires prior knowledge that the server supports HTTP/2 straight away.
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HTTPS requests still do HTTP/2 the standard way with negotiated protocol
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version in the TLS handshake.
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Since 8.10.0 if this option is set for an HTTPS request then the application
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layer protocol version (ALPN) offered to the server is only HTTP/2. Prior to
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that both HTTP/1.1 and HTTP/2 were offered.
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