curl-w32/docs/cmdline-opts/http0.9.md

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c SPDX-License-Identifier Long Tags Protocols Help Category Added Multi See-also Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl http0.9 Versions HTTP Allow HTTP 0.9 responses http 7.64.0 boolean
http1.1
http2
http3
--http0.9 $URL

--http0.9

Tells curl to be fine with HTTP version 0.9 response.

HTTP/0.9 is a response without headers and therefore you can also connect with this to non-HTTP servers and still get a response since curl simply transparently downgrades - if allowed.

HTTP/0.9 is disabled by default (added in 7.66.0)