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For SSL/TLS, it is necessary to use a cryptography library. HAProxy currently
supports the OpenSSL library, and is known to build and work with branches
-1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, 3.0, 3.1 and 3.2. It is recommended to use
+1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, and 3.0 to 3.3. It is recommended to use
at least OpenSSL 1.1.1 to have support for all SSL keywords and configuration
in HAProxy. OpenSSL follows a long-term support cycle similar to HAProxy's,
and each of the branches above receives its own fixes, without forcing you to