Syntax: uwsgi_cache_revalidate on | off; Default: uwsgi_cache_revalidate off; Context: http, server, location This directive appeared in version 1.5.7. Enables revalidation of expired cache items using conditional requests with the “If-Modified-Since” and “If-None-Match” header fields.

Syntax: access_log path [format [buffer=size] [gzip[=level]] [flush=time] [if=condition]];access_log off; Default: access_log logs/access.log combined; Context: http, server, location, if in location, limit_except Sets the path, format, and configuration for a buffered log write. Several logs can be specified on the same level. Logging to syslog can be configured by specifying the “syslog:” prefix in the first parameter. The special value off cancels all ac

Syntax: js_set $variable function; Default: — Context: http Sets an nginScript function for the specified variable.

Syntax: f4f; Default: — Context: location Turns on module processing in the surrounding location.

Syntax: ssi_silent_errors on | off; Default: ssi_silent_errors off; Context: http, server, location If enabled, suppresses the output of the “[an error occurred while processing the directive]” string if an error occurred during SSI processing.

Syntax: image_filter_interlace on | off; Default: image_filter_interlace off; Context: http, server, location This directive appeared in version 1.3.15. If enabled, final images will be interlaced. For JPEG, final images will be in “progressive JPEG” format.

Syntax: uwsgi_modifier1 number; Default: uwsgi_modifier1 0; Context: http, server, location Sets the value of the modifier1 field in the uwsgi packet header.

Syntax: ancient_browser_value string; Default: ancient_browser_value 1; Context: http, server, location Sets a value for the $ancient_browser variables.

Syntax: limit_req_status code; Default: limit_req_status 503; Context: http, server, location This directive appeared in version 1.3.15. Sets the status code to return in response to rejected requests.

Syntax: fastcgi_cache_lock_age time; Default: fastcgi_cache_lock_age 5s; Context: http, server, location This directive appeared in version 1.7.8. If the last request passed to the FastCGI server for populating a new cache element has not completed for the specified time, one more request may be passed to the FastCGI server.