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: google_perftools_profiles file; Default: — Context: main Sets a file name that keeps profiling information of nginx worker process. The ID of the worker process is always a part of the file name and is appended to the end of the file name, after a dot.

Syntax: auth_jwt string [token=$variable] | off; Default: auth_jwt off; Context: http, server, location Enables validation of JSON Web Token. The specified string is used as a realm. Parameter value can contain variables. The optional token parameter specifies a variable that contains JSON Web Token. By default, JWT is passed in the “Authorization” header as a Bearer Token. JWT may be also passed as a cookie or a part of a query string: auth_jwt "closed site" token

Syntax: ssl_prefer_server_ciphers on | off; Default: ssl_prefer_server_ciphers off; Context: http, server Specifies that server ciphers should be preferred over client ciphers when using the SSLv3 and TLS protocols.

Syntax: timeout time; Default: timeout 60s; Context: mail, server Sets the timeout that is used before proxying to the backend starts.

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

Syntax: proxy_ssl_verify_depth number; Default: proxy_ssl_verify_depth 1; Context: http, server, location This directive appeared in version 1.7.0. Sets the verification depth in the proxied HTTPS server certificates chain.

Syntax: js_content function; Default: — Context: location, limit_except Sets an nginScript function as a location content handler.