listen 443 ssl; 而不能像旧版本写
Changes with nginx 1.15.0 05 Jun 2018 *) Change: the "ssl" directive is deprecated; the "ssl" parameter of the "listen" directive should be used instead. *) Change: now nginx detects missing SSL certificates during configuration testing when using the "ssl" parameter of the "listen" directive. *) Feature: now the stream module can handle multiple incoming UDP datagrams from a client within a single session. *) Bugfix: it was possible to specify an incorrect response code in the "proxy_cache_valid" directive. *) Bugfix: nginx could not be built by gcc 8.1. *) Bugfix: logging to syslog stopped on local IP address changes. *) Bugfix: nginx could not be built by clang with CUDA SDK installed; the bug had appeared in 1.13.8. *) Bugfix: "getsockopt(TCP_FASTOPEN) ... failed" messages might appear in logs during binary upgrade when using unix domain listen sockets on FreeBSD. *) Bugfix: nginx could not be built on Fedora 28 Linux. *) Bugfix: request processing rate might exceed configured rate when using the "limit_req" directive. *) Bugfix: in handling of client addresses when using unix domain listen sockets to work with datagrams on Linux. *) Bugfix: in memory allocation error handling.