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经常需要配置Nginx ，其中有许多以 $ 开头的变量，经常需要查阅nginx 所支持的变量。Nginx支持的http变量实现在 ngx_http_variables.c 的 ngx_http_core_variables存储实现： ngx_http_core_variables 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_PROXY || NGX_HTTP_REALIP) { ngx_string("http_x_forwarded_for"), NULL, ngx_http_variable_header, offsetof(ngx_http_request_t, headers_in.x_forwarded_for), 0, 0 }, #endif { ngx_string("http_cookie"), NULL, ngx_http_variable_headers, offsetof(ngx_http_request_t, headers_in.cookies), 0, 0 }, { ngx_string("content_length"), NULL, ngx_http_variable_header, offsetof(ngx_http_request_t, headers_in.content_length), 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("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("body_bytes_sent"), NULL, ngx_http_variable_body_bytes_sent, 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("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("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_null_string, NULL, NULL, 0, 0, 0 } }; 把这些变量提取下，总结如下(1.0.8版)： $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。 (责任编辑：IT) |