SSL_READ_EARLY_DATA_SUCCESS

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) nothrow @nogc
static if((libressl_d.openssl.opensslfeatures.LIBRESSL_HAS_TLS1_3) || (libressl_d.openssl.opensslfeatures.LIBRESSL_INTERNAL))
enum SSL_READ_EARLY_DATA_SUCCESS = 1;

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