← Comprehensive Reference

NGINX Core (HTTP)

124 — Searchable variable reference across core HTTP, stream, and third-party modules — with examples and gotchas.

124 shown
$arg_* The variable $arg_ retrieves the value of a specific query parameter from the… $args The $args variable contains the query string arguments of the request… $binary_remote_addr The $binary_remote_addr variable contains the binary representation of the… Cacheable $body_bytes_sent The $body_bytes_sent variable in NGINX contains the number of bytes sent to… Cacheable $bytes_sent The $bytes_sent variable contains the total number of bytes sent to the client… Cacheable $connection The $connection variable returns the connection descriptor number for the… Cacheable $connection_requests The $connection_requests variable returns the number of requests received on… Cacheable $connection_time The $connection_time variable returns the time taken to establish a connection… $content_length The variable $content_length contains the value of the 'Content-Length' HTTP… Cacheable $content_type The $content_type variable in NGINX holds the value of the Content-Type header… Cacheable $cookie_* The $cookie_ variable prefix is used to access the value of HTTP cookies sent… Cacheable $document_root The $document_root variable returns the root directory of the current server… $document_uri The $document_uri variable contains the URI of the request without any query… $fastcgi_path_info The variable $fastcgi_path_info contains the extra path information that… $fastcgi_script_name The $fastcgi_script_name variable contains the script name being processed by… $grpc_internal_trailers The variable $grpc_internal_trailers contains the internal trailer fields of a… $gzip_ratio The $gzip_ratio variable holds the compression ratio achieved by gzip when… Cacheable $host The $host variable in NGINX holds the host name from the HTTP request header… Cacheable $hostname The $hostname variable returns the hostname of the server as specified in the… Cacheable $http_* The variable $http_ holds the value of a specific HTTP header from the client… Cacheable $http_cookie The $http_cookie variable captures the value of the Cookie header from an… Cacheable $http_host The `$http_host` variable contains the value of the Host header sent by the… Cacheable $http_referer The $http_referer variable contains the value of the Referer HTTP header from… Cacheable $http_user_agent The $http_user_agent variable contains the value of the User-Agent HTTP… Cacheable $http_via The $http_via variable retrieves the value of the 'via' header sent by… Cacheable $http_x_forwarded_for The $http_x_forwarded_for variable contains the value of the X-Forwarded-For… Cacheable $https The $https variable indicates whether a request was made over HTTPS (secure)… Cacheable $invalid_referer The $invalid_referer variable is set to 1 if the request's referer is not… Cacheable $is_args The $is_args variable indicates whether the current request includes arguments… $is_request_port The $is_request_port variable indicates whether the request was made on an… Cacheable $limit_conn_status $limit_conn_status returns the status of connection limiting on a per-client… $limit_rate $limit_rate controls the maximum transfer rate for a response, effectively… $limit_req_status The $limit_req_status variable outputs the status code of the request limiting… $msec The $msec variable contains the current time in milliseconds since the epoch. $nginx_version The variable $nginx_version holds the version number of the currently running… Cacheable $pid The $pid variable returns the process ID (PID) of the NGINX worker process… Cacheable $pipe The $pipe variable indicates whether the request is being processed in a… Cacheable $proxy_add_via The $proxy_add_via variable is used to append a 'Via' header to HTTP requests… Cacheable $proxy_add_x_forwarded_for The $proxy_add_x_forwarded_for variable appends the client's IP address to the… Cacheable $proxy_host The variable $proxy_host contains the hostname of the upstream server being… $proxy_internal_body_length $proxy_internal_body_length returns the length of the request body received… $proxy_internal_chunked $proxy_internal_chunked indicates whether internal responses should be sent in… $proxy_internal_connection $proxy_internal_connection indicates whether the connection to a proxied… $proxy_internal_host $proxy_internal_host returns the hostname of the internal proxy for a request. $proxy_port The $proxy_port variable returns the port number of the proxied server. $proxy_protocol_addr $proxy_protocol_addr returns the client address from the PROXY protocol, if… Cacheable $proxy_protocol_port The $proxy_protocol_port variable returns the port number from which a proxied… Cacheable $proxy_protocol_server_addr $proxy_protocol_server_addr returns the IP address of the client as sent by… Cacheable $proxy_protocol_server_port The $proxy_protocol_server_port variable returns the server port as specified… Cacheable $proxy_protocol_tlv_* The $proxy_protocol_tlv_ variables provide access to information contained in… Cacheable $query_string The $query_string variable contains the query string part of the client's… $realip_remote_addr The variable $realip_remote_addr contains the original client IP address when… Cacheable $realip_remote_port The variable $realip_remote_port holds the port number of the client making… Cacheable $realpath_root The $realpath_root variable returns the canonical filename of the root… $remote_addr The $remote_addr variable holds the IP address of the client making the… Cacheable $remote_port The $remote_port variable in NGINX contains the port number of the client… Cacheable $remote_user The $remote_user variable contains the username supplied by the client during… Cacheable $request The $request variable contains the full request line received from the client… Cacheable $request_body The $request_body variable contains the raw body of the client request. Cacheable $request_body_file The $request_body_file variable contains the path to a temporary file holding… Cacheable $request_completion The variable $request_completion returns the status of the request processing… Cacheable $request_filename The $request_filename variable contains the full path to the file being… $request_id The $request_id variable contains a unique identifier for each request… Cacheable $request_length The variable $request_length returns the total size of the client request body… $request_method The $request_method variable in NGINX contains the HTTP method used for the… $request_port The $request_port variable contains the port number used by the client to send… Cacheable $request_time $request_time contains the total time taken to process the request, in seconds… $request_uri The $request_uri variable contains the original request URI as sent by the… Cacheable $scheme The $scheme variable in NGINX returns the protocol of the current request… Cacheable $secure_link The $secure_link variable is used to validate a secure link to a resource… Cacheable $secure_link_expires $secure_link_expires returns the expiration timestamp for a secure link in… Cacheable $sent_http_* The $sent_http_ prefix variable returns HTTP response headers sent to the… Cacheable $sent_http_cache_control $sent_http_cache_control contains the value of the 'Cache-Control' header sent… Cacheable $sent_http_connection The variable $sent_http_connection holds the value of the 'Connection' header… Cacheable $sent_http_content_length The $sent_http_content_length variable returns the value of the Content-Length… Cacheable $sent_http_content_type The $sent_http_content_type variable holds the Content-Type header sent in the… Cacheable $sent_http_keep_alive The $sent_http_keep_alive variable in NGINX contains the value of the… Cacheable $sent_http_last_modified The $sent_http_last_modified variable contains the Last-Modified header… Cacheable $sent_http_link The $sent_http_link variable contains the value of the Link HTTP response… Cacheable $sent_http_location The $sent_http_location variable contains the HTTP Location header sent in the… Cacheable $sent_http_transfer_encoding $sent_http_transfer_encoding contains the value of the 'Transfer-Encoding'… Cacheable $sent_trailer_* The $sent_trailer_ variable is a prefix variable used to retrieve trailers… Cacheable $server_addr The $server_addr variable returns the IP address of the server as specified in… Cacheable $server_name The $server_name variable represents the name of the virtual host serving the… Cacheable $server_port The $server_port variable returns the port number on which the current request… Cacheable $server_protocol The $server_protocol variable contains the protocol used for the current… Cacheable $ssl_alpn_protocol The variable $ssl_alpn_protocol contains the Application-Layer Protocol… Cacheable $ssl_cipher The $ssl_cipher variable contains the name of the cipher used for SSL/TLS… Cacheable $ssl_ciphers The $ssl_ciphers variable contains the list of SSL/TLS ciphers used for the… Cacheable $ssl_client_cert The variable $ssl_client_cert contains the client's SSL certificate as a PEM… Cacheable $ssl_client_escaped_cert The $ssl_client_escaped_cert variable contains the PEM-encoded and URL-escaped… Cacheable $ssl_client_fingerprint The variable $ssl_client_fingerprint represents the fingerprint of the… Cacheable $ssl_client_i_dn The $ssl_client_i_dn variable holds the Identity Distinguished Name (DN) of a… Cacheable $ssl_client_i_dn_legacy The $ssl_client_i_dn_legacy variable returns the legacy distinguished name… Cacheable $ssl_client_raw_cert The $ssl_client_raw_cert variable contains the raw bytes of the client's SSL… Cacheable $ssl_client_s_dn The $ssl_client_s_dn variable contains the subject distinguished name from the… Cacheable $ssl_client_s_dn_legacy The $ssl_client_s_dn_legacy variable contains the legacy subject distinguished… Cacheable $ssl_client_serial The $ssl_client_serial variable contains the serial number of the client SSL… Cacheable $ssl_client_sigalg The variable $ssl_client_sigalg contains the signature algorithm used by the… Cacheable $ssl_client_v_end The variable $ssl_client_v_end contains the end time of the client's SSL… Cacheable $ssl_client_v_remain $ssl_client_v_remain returns the remaining number of bytes in the SSL client's… Cacheable $ssl_client_v_start $ssl_client_v_start returns the timestamp when the SSL handshake is completed… Cacheable $ssl_client_verify $ssl_client_verify indicates the verification status of a client certificate… Cacheable $ssl_curve The $ssl_curve variable returns the name of the elliptic curve used for… Cacheable $ssl_curves The $ssl_curves variable returns the list of elliptic curves negotiated during… Cacheable $ssl_early_data The $ssl_early_data variable indicates whether early data has been received in… $ssl_ech_outer_server_name $ssl_ech_outer_server_name returns the outer server name used in the Encrypted… Cacheable $ssl_ech_status The $ssl_ech_status variable indicates the status of the Encrypted ClientHello… Cacheable $ssl_protocol $ssl_protocol contains the SSL/TLS protocol version used for a connection. Cacheable $ssl_server_name The variable $ssl_server_name contains the name of the server specified with… Cacheable $ssl_session_id The $ssl_session_id variable contains the unique identifier for the current… Cacheable $ssl_session_reused The $ssl_session_reused variable indicates whether an existing SSL session was… Cacheable $ssl_sigalg The $ssl_sigalg variable returns the signature algorithm used in the SSL… Cacheable $status The $status variable returns the HTTP response status code of the current… $tcpinfo_rcv_space The $tcpinfo_rcv_space variable returns the amount of memory allocated for the… $tcpinfo_rtt The $tcpinfo_rtt variable returns the round-trip time (RTT) of the TCP… $tcpinfo_rttvar The $tcpinfo_rttvar variable returns the round-trip time variation for TCP… $tcpinfo_snd_cwnd $tcpinfo_snd_cwnd returns the TCP send congestion window size in bytes. $time_iso8601 The variable $time_iso8601 returns the current time in ISO 8601 format. $time_local The $time_local variable returns the current local time in the format used by… $uid_got The $uid_got variable returns the user ID of the request's owner, which is… Cacheable $uid_reset The $uid_reset variable indicates whether the UID of a request should be reset… Cacheable $uid_set The $uid_set variable contains the user ID set for the current request context… Cacheable $uri The $uri variable in NGINX returns the URI part of a requested resource…