Changes with nginx 1.11.10 14 Feb 2017 *) Change: cache header format has been changed, previously cached responses will be invalidated. *) Feature: support of "stale-while-revalidate" and "stale-if-error" extensions in the "Cache-Control" backend response header line. *) Feature: the "proxy_cache_background_update", "fastcgi_cache_background_update", "scgi_cache_background_update", and "uwsgi_cache_background_update" directives. *) Feature: nginx is now able to cache responses with the "Vary" header line up to 128 characters long (instead of 42 characters in previous versions). *) Feature: the "build" parameter of the "server_tokens" directive. Thanks to Tom Thorogood. *) Bugfix: "[crit] SSL_write() failed" messages might appear in logs when handling requests with the "Expect: 100-continue" request header line. *) Bugfix: the ngx_http_slice_module did not work in named locations. *) Bugfix: a segmentation fault might occur in a worker process when using AIO after an "X-Accel-Redirect" redirection. *) Bugfix: reduced memory consumption for long-lived requests using gzipping. -- Maxim Dounin http://nginx.org/