#include <openssl/ssl.h> unsigned int SSL_SESSION_get_compress_id(const SSL_SESSION *s);
If compression has been negotiated for an ssl session then SSL_SESSION_get_compress_id() will return 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() returns the id of the compression method or 0 if none.
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