debug_vars

location = /debug_vars {
    default_type text/plain;
    return 200 "
http_host:      $http_host
http_user_agent:        $http_user_agent
http_referer:   $http_referer
http_via:       $http_via
http_x_forwarded_for:   $http_x_forwarded_for
http_cookie:    $http_cookie
content_length: $content_length
content_type:   $content_type
host:   $host
binary_remote_addr:     $binary_remote_addr
remote_addr:    $remote_addr
remote_port:    $remote_port
proxy_protocol_addr:    $proxy_protocol_addr
proxy_protocol_port:    $proxy_protocol_port
server_addr:    $server_addr
server_port:    $server_port
server_protocol:        $server_protocol
scheme: $scheme
https:  $https
request_uri:    $request_uri
uri:    $uri
document_uri:   $document_uri
request:        $request
document_root:  $document_root
realpath_root:  $realpath_root
query_string:   $query_string
args:   $args
is_args:        $is_args
request_filename:       $request_filename
server_name:    $server_name
request_method: $request_method
remote_user:    $remote_user
bytes_sent:     $bytes_sent
body_bytes_sent:        $body_bytes_sent
pipe:   $pipe
request_completion:     $request_completion
request_body:   $request_body
request_body_file:      $request_body_file
request_length: $request_length
request_time:   $request_time
request_id:     $request_id
status: $status
sent_http_content_type: $sent_http_content_type
sent_http_content_length:       $sent_http_content_length
sent_http_location:     $sent_http_location
sent_http_last_modified:        $sent_http_last_modified
sent_http_connection:   $sent_http_connection
sent_http_keep_alive:   $sent_http_keep_alive
sent_http_transfer_encoding:    $sent_http_transfer_encoding
sent_http_cache_control:        $sent_http_cache_control
sent_http_link: $sent_http_link
limit_rate:     $limit_rate
connection:     $connection
connection_requests:    $connection_requests
nginx_version:  $nginx_version
hostname:       $hostname
pid:    $pid
msec:   $msec
time_iso8601:   $time_iso8601
time_local:     $time_local
tcpinfo_rtt:    $tcpinfo_rtt
tcpinfo_rttvar: $tcpinfo_rttvar
tcpinfo_snd_cwnd:       $tcpinfo_snd_cwnd
tcpinfo_rcv_space:      $tcpinfo_rcv_space
http_:  $http_
sent_http_:     $sent_http_
sent_trailer_:  $sent_trailer_
cookie_:        $cookie_
arg_:   $arg_
";
}