Syntax: f4f; Default: — Context: location
Syntax: proxy_protocol on | off; Default: proxy_protocol off;
Syntax: scgi_hide_header field; Default: — Context:
Syntax: geoip_city file; Default: — Context:
Syntax: limit_req_status code; Default: limit_req_status 503;
Syntax: google_perftools_profiles file; Default: —
Syntax: image_filter_transparency on|off; Default: image_filter_transparency
Syntax: proxy_ssl_certificate file; Default: — Context:
Syntax: ssl_client_certificate file; Default: — Context:
Syntax: geo [$address] $variable { ... } Default: —
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