Long: http0.9 Tags: Versions Protocols: HTTP Added: Help: Allow HTTP 0.9 responses --- Tells curl to be fine with HTTP version 0.9 response. HTTP/0.9 is a completely headerless response and therefore you can also connect with this to non-HTTP servers and still get a response since curl will simply transparently downgrade - if allowed. A future curl version will deny continuing if the response isn't at least HTTP/1.0 unless this option is used.