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CURLOPT_SSL_CTX_FUNCTION.md: expand on effects connection reuse

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Closes #21164
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Daniel Stenberg 2026-03-30 23:11:38 +02:00
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docs/libcurl/opts/CURLOPT_SSL_CTX_FUNCTION.md
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@ -70,6 +70,13 @@ anything about it, which then subsequently can lead to libcurl unknowingly
reusing SSL connections with different properties. To remedy this you may set
CURLOPT_FORBID_REUSE(3) from the callback function.
A connection that is set up with this callback can be put in the connection
pool by libcurl and then reused in following transfers without the callback
being called. The connection may even be selected from the pool to be used for
transfers not using this callback. If the callback should only be valid for
the specific transfer the callback verifies, it should be marked unsuitable
for reuse with CURLOPT_FORBID_REUSE(3).
If you are using DNS-over-HTTPS (DoH) via CURLOPT_DOH_URL(3) then this
callback is also called for those transfers and the curl handle is set to an
internal handle. **This behavior is subject to change.** We recommend setting