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Nginx directive execution order

Embedded Variables

Name Description
$arg_name argument _name_ in the request line
$args arguments in the request line
$binary_remote_addr client address in a binary form, value’s length is always 4 bytes
$body_bytes_sent number of bytes sent to a client, not counting the response header; this variable is compatible with the “%B” parameter of the mod_log_config Apache module
$bytes_sent number of bytes sent to a client (1.3.8, 1.2.5)
$connection connection serial number (1.3.8, 1.2.5)
$connection_requests current number of requests made through a connection (1.3.8, 1.2.5)
$content_length “Content-Length” request header field
$content_type “Content-Type” request header field
$cookie_name the _name_ cookie
$document_root root or alias directive’s value for the current request
$document_uri same as $uri
$host in this order of precedence: host name from the request line, or host name from the “Host” request header field, or the server name matching a request
$hostname host name
$http_name arbitrary request header field; the last part of a variable name is the field name converted to lower case with dashes replaced by underscores
$https “on” if connection operates in SSL mode, or an empty string otherwise
$is_args “?” if a request line has arguments, or an empty string otherwise
$limit_rate setting this variable enables response rate limiting; see limit_rate
$msec current time in seconds with the milliseconds resolution (1.3.9, 1.2.6)
$nginx_version nginx version
$pid PID of the worker process
$pipe “p” if request was pipelined, “.” otherwise (1.3.12, 1.2.7)
$proxy_protocol_addr client address from the PROXY protocol header, or an empty string otherwise (1.5.12).  The PROXY protocol must be previously enabled by setting the proxy_protocol parameter in the listendirective.
$query_string same as $args
$realpath_root an absolute pathname corresponding to the root or alias directive’s value for the current request, with all symbolic links resolved to real paths
$remote_addr client address
$remote_port client port
$remote_user user name supplied with the Basic authentication
$request full original request line
$request_body request body.  The variable’s value is made available in locations processed by the proxy_pass and fastcgi_passdirectives.
$request_body_file name of a temporary file with the request body.  At the end of processing, the file needs to be removed. To always write the request body to a file,client_body_in_file_only needs to be enabled. When the name of a temporary file is passed in a proxied request or in a request to a FastCGI server, passing the request body should be disabled by theproxy_pass_request_body off and fastcgi_pass_request_body off directives, respectively.
$request_completion “OK” if a request has completed, or an empty string otherwise
$request_filename file path for the current request, based on the root or alias directives, and the request URI
$request_length request length (including request line, header, and request body) (1.3.12, 1.2.7)
$request_method request method, usually “GET” or “POST”
$request_time request processing time in seconds with a milliseconds resolution (1.3.9, 1.2.6); time elapsed since the first bytes were read from the client
$request_uri full original request URI (with arguments)
$scheme request scheme, “http” or “https”
$sent_http_``_name_ arbitrary response header field; the last part of a variable name is the field name converted to lower case with dashes replaced by underscores
$server_addr an address of the server which accepted a request.  Computing a value of this variable usually requires one system call. To avoid a system call, the listendirectives must specify addresses and use the bind parameter.
$server_name name of the server which accepted a request
$server_port port of the server which accepted a request
$server_protocol request protocol, usually “HTTP/1.0” or “HTTP/1.1”
$status response status (1.3.2, 1.2.2)
$tcpinfo_rtt,
$tcpinfo_rttvar,
$tcpinfo_snd_cwnd,
$tcpinfo_rcv_space		 information about the client TCP connection; available on systems that support the TCP_INFO socket option
$time_iso8601 local time in the ISO 8601 standard format (1.3.12, 1.2.7)
$time_local local time in the Common Log Format (1.3.12, 1.2.7)
$uri current URI in request, normalized  The value of $uri may change during request processing, e.g. when doing internal redirects, or when using index files.