Syntax: fastcgi_cache_revalidate on | off; Default: fastcgi_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: proxy_temp_path path [level1 [level2 [level3]]]; Default: proxy_temp_path proxy_temp; Context: http, server, location Defines a directory for storing temporary files with data received from proxied servers. Up to three-level subdirectory hierarchy can be used underneath the specified directory. For example, in the following configuration proxy_temp_path /spool/nginx/proxy_temp 1 2; a temporary file might look like this: /spool/nginx/proxy_temp/7/45/00

Syntax: limit_conn zone number; Default: — Context: stream, server Sets the shared memory zone and the maximum allowed number of connections for a given key value. When this limit is exceeded, the server will close the connection. For example, the directives limit_conn_zone $binary_remote_addr zone=addr:10m; server { ... limit_conn addr 1; } allow only one connection per an IP address at a time. When several limit_conn directives are specified, any configured limit w

Syntax: status_format json;status_format jsonp [callback]; Default: status_format json; Context: http, server, location By default, status information is output in the JSON format. Alternatively, data may be output as JSONP. The callback parameter specifies the name of a callback function. The value can contain variables. If parameter is omitted, or the computed value is an empty string, then “ngx_status_jsonp_callback” is used.

nginx for Windows Known issues Possible future enhancements Version of nginx for Windows uses the native Win32 API (not the Cygwin emulation layer). Only the select() connection processing method is currently used, so high performance and scalability should not be expected. Due to this and some other known issues version of nginx for Windows is considered to be a beta version. At this time, it provides almost the same functionality as a UNIX version of nginx except for XSLT filter, image fil

Syntax: env variable[=value]; Default: env TZ; Context: main By default, nginx removes all environment variables inherited from its parent process except the TZ variable. This directive allows preserving some of the inherited variables, changing their values, or creating new environment variables. These variables are then: inherited during a live upgrade of an executable file; used by the ngx_http_perl_module module; used by worker processes. One should bear in mind that cont

Syntax: autoindex_format html | xml | json | jsonp; Default: autoindex_format html; Context: http, server, location This directive appeared in version 1.7.9. Sets the format of a directory listing. When the JSONP format is used, the name of a callback function is set with the callback request argument. If the argument is missing or has an empty value, then the JSON format is used. The XML output can be transformed using the ngx_http_xslt_module module.

Syntax: zone name [size]; Default: — Context: upstream This directive appeared in version 1.9.0. Defines the name and size of the shared memory zone that keeps the group’s configuration and run-time state that are shared between worker processes. Several groups may share the same zone. In this case, it is enough to specify the size only once. Additionally, as part of our commercial subscription, such groups allow changing the group membership or modifying the settings of a parti

Syntax: http2_max_header_size size; Default: http2_max_header_size 16k; Context: http, server Limits the maximum size of the entire request header list after HPACK decompression. For most requests, the default limit should be enough.

Logging to syslog The error_log and access_log directives support logging to syslog. The following parameters configure logging to syslog: server=address Defines the address of a syslog server. The address can be specified as a domain name or IP address, with an optional port, or as a UNIX-domain socket path specified after the “unix:” prefix. If port is not specified, the UDP port 514 is used. If a domain name resolves to several IP addresses, the first resolved address is used. facilit