Update from 1.5.3 to 1.5.4.
*) Change: the "js" extension MIME type has been changed to
directive was changed accordingly.
*) Change: now the "image_filter" directive with the "size" parameter
returns responses with the "application/json" MIME type.
*) Feature: the ngx_http_auth_request_module.
*) Bugfix: a segmentation fault might occur on start or during
reconfiguration if the "try_files" directive was used with an empty
*) Bugfix: memory leak if relative paths were specified using variables
in the "root" or "auth_basic_user_file" directives.
*) Bugfix: the "valid_referers" directive incorrectly executed regular
expressions if a "Referer" header started with "https://".
Thanks to Liangbin Li.
*) Bugfix: responses might hang if subrequests were used and an SSL
handshake error happened during subrequest processing.
Thanks to Aviram Cohen.
*) Bugfix: in the ngx_http_autoindex_module.
*) Bugfix: in the ngx_http_spdy_module.