Ssl_get_servername return null

 #include <openssl/ssl.h>

 long SSL_CTX_set_tlsext_servername_callback(SSL_CTX *ctx,
                                   int (*cb)(SSL *, int *, void *));
 long SSL_CTX_set_tlsext_servername_arg(SSL_CTX *ctx, void *arg);

 const char *SSL_get_servername(const SSL *s, const int type);
 int SSL_get_servername_type(const SSL *s);

Source: openssl.org

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