nginx中的变量

2014/12/1114:21:26 发表评论

/*
 * TODO:
 *     Apache CGI: AUTH_TYPE, PATH_INFO (null), PATH_TRANSLATED
 *                 REMOTE_HOST (null), REMOTE_IDENT (null),
 *                 SERVER_SOFTWARE
 *
 *     Apache SSI: DOCUMENT_NAME, LAST_MODIFIED, USER_NAME (file owner)
 */

/*
 * the $http_host, $http_user_agent, $http_referer, and $http_via
 * variables may be handled by generic
 * ngx_http_variable_unknown_header_in(), but for performance reasons
 * they are handled using dedicated entries
 */

static ngx_http_variable_t  ngx_http_core_variables[] = {

    { ngx_string("http_host"), NULL, ngx_http_variable_header,
      offsetof(ngx_http_request_t, headers_in.host), 0, 0 },

    { ngx_string("http_user_agent"), NULL, ngx_http_variable_header,
      offsetof(ngx_http_request_t, headers_in.user_agent), 0, 0 },

    { ngx_string("http_referer"), NULL, ngx_http_variable_header,
      offsetof(ngx_http_request_t, headers_in.referer), 0, 0 },

#if (NGX_HTTP_GZIP)
    { ngx_string("http_via"), NULL, ngx_http_variable_header,
      offsetof(ngx_http_request_t, headers_in.via), 0, 0 },
#endif

#if (NGX_HTTP_X_FORWARDED_FOR)
    { ngx_string("http_x_forwarded_for"), NULL, ngx_http_variable_headers,
      offsetof(ngx_http_request_t, headers_in.x_forwarded_for), 0, 0 },
#endif

    { ngx_string("http_cookie"), NULL, ngx_http_variable_cookies,
      offsetof(ngx_http_request_t, headers_in.cookies), 0, 0 },

    { ngx_string("content_length"), NULL, ngx_http_variable_content_length,
      0, 0, 0 },

    { ngx_string("content_type"), NULL, ngx_http_variable_header,
      offsetof(ngx_http_request_t, headers_in.content_type), 0, 0 },

    { ngx_string("host"), NULL, ngx_http_variable_host, 0, 0, 0 },

    { ngx_string("binary_remote_addr"), NULL,
      ngx_http_variable_binary_remote_addr, 0, 0, 0 },

    { ngx_string("remote_addr"), NULL, ngx_http_variable_remote_addr, 0, 0, 0 },

    { ngx_string("remote_port"), NULL, ngx_http_variable_remote_port, 0, 0, 0 },

    { ngx_string("server_addr"), NULL, ngx_http_variable_server_addr, 0, 0, 0 },

    { ngx_string("server_port"), NULL, ngx_http_variable_server_port, 0, 0, 0 },

    { ngx_string("server_protocol"), NULL, ngx_http_variable_request,
      offsetof(ngx_http_request_t, http_protocol), 0, 0 },

    { ngx_string("scheme"), NULL, ngx_http_variable_scheme, 0, 0, 0 },

    { ngx_string("https"), NULL, ngx_http_variable_https, 0, 0, 0 },

    { ngx_string("request_uri"), NULL, ngx_http_variable_request,
      offsetof(ngx_http_request_t, unparsed_uri), 0, 0 },

    { ngx_string("uri"), NULL, ngx_http_variable_request,
      offsetof(ngx_http_request_t, uri),
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("document_uri"), NULL, ngx_http_variable_request,
      offsetof(ngx_http_request_t, uri),
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("request"), NULL, ngx_http_variable_request_line, 0, 0, 0 },

    { ngx_string("document_root"), NULL,
      ngx_http_variable_document_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("realpath_root"), NULL,
      ngx_http_variable_realpath_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("query_string"), NULL, ngx_http_variable_request,
      offsetof(ngx_http_request_t, args),
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("args"),
      ngx_http_variable_request_set,
      ngx_http_variable_request,
      offsetof(ngx_http_request_t, args),
      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("is_args"), NULL, ngx_http_variable_is_args,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("request_filename"), NULL,
      ngx_http_variable_request_filename, 0,
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("server_name"), NULL, ngx_http_variable_server_name, 0, 0, 0 },

    { ngx_string("request_method"), NULL,
      ngx_http_variable_request_method, 0,
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("remote_user"), NULL, ngx_http_variable_remote_user, 0, 0, 0 },

    { ngx_string("bytes_sent"), NULL, ngx_http_variable_bytes_sent,
      0, 0, 0 },

    { ngx_string("body_bytes_sent"), NULL, ngx_http_variable_body_bytes_sent,
      0, 0, 0 },

    { ngx_string("pipe"), NULL, ngx_http_variable_pipe,
      0, 0, 0 },

    { ngx_string("request_completion"), NULL,
      ngx_http_variable_request_completion,
      0, 0, 0 },

    { ngx_string("request_body"), NULL,
      ngx_http_variable_request_body,
      0, 0, 0 },

    { ngx_string("request_body_file"), NULL,
      ngx_http_variable_request_body_file,
      0, 0, 0 },

    { ngx_string("request_length"), NULL, ngx_http_variable_request_length,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("request_time"), NULL, ngx_http_variable_request_time,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("status"), NULL,
      ngx_http_variable_status, 0,
      NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("sent_http_content_type"), NULL,
      ngx_http_variable_sent_content_type, 0, 0, 0 },

    { ngx_string("sent_http_content_length"), NULL,
      ngx_http_variable_sent_content_length, 0, 0, 0 },

    { ngx_string("sent_http_location"), NULL,
      ngx_http_variable_sent_location, 0, 0, 0 },

    { ngx_string("sent_http_last_modified"), NULL,
      ngx_http_variable_sent_last_modified, 0, 0, 0 },

    { ngx_string("sent_http_connection"), NULL,
      ngx_http_variable_sent_connection, 0, 0, 0 },

    { ngx_string("sent_http_keep_alive"), NULL,
      ngx_http_variable_sent_keep_alive, 0, 0, 0 },

    { ngx_string("sent_http_transfer_encoding"), NULL,
      ngx_http_variable_sent_transfer_encoding, 0, 0, 0 },

    { ngx_string("sent_http_cache_control"), NULL, ngx_http_variable_headers,
      offsetof(ngx_http_request_t, headers_out.cache_control), 0, 0 },

    { ngx_string("limit_rate"), ngx_http_variable_request_set_size,
      ngx_http_variable_request_get_size,
      offsetof(ngx_http_request_t, limit_rate),
      NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("connection"), NULL,
      ngx_http_variable_connection, 0, 0, 0 },

    { ngx_string("connection_requests"), NULL,
      ngx_http_variable_connection_requests, 0, 0, 0 },

    { ngx_string("nginx_version"), NULL, ngx_http_variable_nginx_version,
      0, 0, 0 },

    { ngx_string("hostname"), NULL, ngx_http_variable_hostname,
      0, 0, 0 },

    { ngx_string("pid"), NULL, ngx_http_variable_pid,
      0, 0, 0 },

    { ngx_string("msec"), NULL, ngx_http_variable_msec,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("time_iso8601"), NULL, ngx_http_variable_time_iso8601,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("time_local"), NULL, ngx_http_variable_time_local,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

#if (NGX_HAVE_TCP_INFO)
    { ngx_string("tcpinfo_rtt"), NULL, ngx_http_variable_tcpinfo,
      0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("tcpinfo_rttvar"), NULL, ngx_http_variable_tcpinfo,
      1, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("tcpinfo_snd_cwnd"), NULL, ngx_http_variable_tcpinfo,
      2, NGX_HTTP_VAR_NOCACHEABLE, 0 },

    { ngx_string("tcpinfo_rcv_space"), NULL, ngx_http_variable_tcpinfo,
      3, NGX_HTTP_VAR_NOCACHEABLE, 0 },
#endif

    { ngx_null_string, NULL, NULL, 0, 0, 0 }
};

$args 请求中的参数;
$binary_remote_addr 远程地址的二进制表示
$body_bytes_sent 已发送的消息体字节数
$content_length HTTP请求信息里的"Content-Length";
$content_type 请求信息里的"Content-Type";
$document_root 针对当前请求的根路径设置值;
$document_uri 与$uri相同;
$host 请求信息中的"Host",如果请求中没有Host行,则等于设置的服务器名;
$hostname
$http_cookie cookie 信息
$http_post
$http_referer 引用地址
$http_user_agent 客户端代理信息
$http_via 最后一个访问服务器的Ip地址。http://www.cnblogs.com/deng02/archive/2009/02/11/1387911.html
$http_x_forwarded_for 相当于网络访问路径。http://www.cnblogs.com/craig/archive/2008/11/18/1335809.html
$is_args
$limit_rate 对连接速率的限制;
$nginx_version
$pid
$query_string 与$args相同;
$realpath_root
$remote_addr 客户端地址;
$remote_port 客户端端口号;
$remote_user 客户端用户名,认证用;
$request 用户请求
$request_body
$request_body_file 发往后端的本地文件名称
$request_completion
$request_filename 当前请求的文件路径名
$request_method 请求的方法,比如"GET"、"POST"等;
$request_uri 请求的URI,带参数;
$scheme 所用的协议,比如http或者是https,比如rewrite^(.+)$$scheme://example.com$1redirect;
$sent_http_cache_control
$sent_http_connection
$sent_http_content_length
$sent_http_content_type
$sent_http_keep_alive
$sent_http_last_modified
$sent_http_location
$sent_http_transfer_encoding
$server_addr 服务器地址,如果没有用listen指明服务器地址,使用这个变量将发起一次系统调用以取得地址(造成资源浪费);
$server_name 请求到达的服务器名;
$server_port 请求到达的服务器端口号;
$server_protocol 请求的协议版本,"HTTP/1.0"或"HTTP/1.1";
$uri 请求的URI,可能和最初的值有不同,比如经过重定向之类的。
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