Changes with nginx 1.9.4 18 Aug 2015 *) Change: the "proxy_downstream_buffer" and "proxy_upstream_buffer" directives of the stream module are replaced with the "proxy_buffer_size" directive. *) Feature: the "tcp_nodelay" directive in the stream module. *) Feature: multiple "sub_filter" directives can be used simultaneously. *) Feature: variables support in the search string of the "sub_filter" directive. *) Workaround: configuration testing might fail under Linux OpenVZ. Thanks to Gena Makhomed. *) Bugfix: old worker processes might hog CPU after reconfiguration with a large number of worker_connections. *) Bugfix: a segmentation fault might occur in a worker process if the "try_files" and "alias" directives were used inside a location given by a regular expression; the bug had appeared in 1.7.1. *) Bugfix: the "try_files" directive inside a nested location given by a regular expression worked incorrectly if the "alias" directive was used in the outer location. *) Bugfix: in hash table initialization error handling. *) Bugfix: nginx could not be built with Visual Studio 2015.