nginx_1.12.0_ssl_session_cache.patch

diff -ru src/event/ngx_event_openssl.c src2/event/ngx_event_openssl.c
--- src/event/ngx_event_openssl.c	2017-07-31 14:41:47.204433207 -0400
+++ src2/event/ngx_event_openssl.c	2017-07-31 14:44:27.810431433 -0400
@@ -1338,6 +1338,14 @@
         return NGX_AGAIN;
     }
 
+    if (sslerr == SSL_ERROR_WANT_ASYNC)
+    {
+        c->read->handler = ngx_ssl_handshake_handler;
+        c->write->handler = ngx_ssl_handshake_handler;
+        c->read->ready = 0;
+        return NGX_AGAIN;
+    }
+
     err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
 
     c->ssl->no_wait_shutdown = 1;