+=item B<OSSL_CMP_OPT_KEEP_ALIVE>
+
+ If the given value is 0 then HTTP connections are not kept open
+ after receiving a response, which is the default behavior for HTTP 1.0.
+ If the value is 1 or 2 then persistent connections are requested.
+ If the value is 2 then persistent connections are required,
+ i.e., in case the server does not grant them an error occurs.
+ The default value is 1: prefer to keep the connection open.
+