The "http request" and "https proxy request" errors cannot happen
with HTTP due to pre-handshake checks in ngx_http_ssl_handshake(),
but can happen when SSL is used in stream and mail modules.
|| n == SSL_R_DIGEST_CHECK_FAILED /* 149 */
|| n == SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST /* 151 */
|| n == SSL_R_EXCESSIVE_MESSAGE_SIZE /* 152 */
+ || n == SSL_R_HTTPS_PROXY_REQUEST /* 155 */
+ || n == SSL_R_HTTP_REQUEST /* 156 */
|| n == SSL_R_LENGTH_MISMATCH /* 159 */
#ifdef SSL_R_NO_CIPHERS_PASSED
|| n == SSL_R_NO_CIPHERS_PASSED /* 182 */