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docs: fix documentation of connect_only 2

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Setting CURLOPT_CONNECT_ONLY with value 2 is only defined
for WebSocket and the effect on other protocols is undetermined.
That includes the HTTP urls.

Fixes #17621
Reported-by: Kirill Obukhov
Closes #17635
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Stefan Eissing 2025-06-16 09:54:20 +02:00 • committed by Daniel Stenberg
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docs/libcurl/opts/CURLOPT_CONNECT_ONLY.md
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@ -38,9 +38,10 @@ curl_easy_getinfo(3) as the library can set up the connection and then
the application can obtain the most recently used socket for special data
transfers.
Since 7.86.0, this option can be set to '2' and if HTTP or WebSocket are used,
Since 7.86.0, this option can be set to '2' and if WebSocket is used,
libcurl performs the request and reads all response headers before handing
over control to the application.
over control to the application. For other protocols the behavior of '2'
is undefined.
Transfers marked connect only do not reuse any existing connections and
connections marked connect only are not allowed to get reused.