get details about the compression associated with a
If compression has been negotiated for an ssl session,
SSL_SESSION_get_compress_id() returns the id for the
compression method, or 0 otherwise. The only built-in supported compression
method is zlib, which has an id of 1.
SSL_SESSION_get_compress_id() first appeared in OpenSSL
1.0.1 and has been available since OpenBSD 5.3.