AUTH_TYPE   When the browser authenticates itself, this variable contains the authentication type in use. The most common value is Basic.
COMSPEC   Reports the path to COMMAND.COM when run locally in Windows.
CONFIGS   If any server configuration options were set, this is a space-separated array of them all.
CONTENT_LENGTH   The length of the data (in bytes or the number of characters) passed to the CGI program through standard input.
CONTENT_TYPE   The MIME type of the query data, such as "text/html".
COOKIE_name   The value of the cookie name.
COOKIES   A space-separated list of all cookie names sent with this request.
DATE_GMT   Current date and time in GMT.
DATE_LOCAL   Current date and time in the local time zone.
DOCUMENT_NAME   The current file.
DOCUMENT_PATH_INFO   Additional path information passed to a document.
DOCUMENT_ROOT   The root directory of the server (so you can use the same script on multiple sites).
DOCUMENT_URI   Virtual path to the file.
GATEWAY_INTERFACE   The revision of the Common Gateway Interface that the server uses.
HTTP_ACCEPT   A list of the MIME types that the client can accept.
HTTP_ACCEPT_CHARSET   The contents of the HTTP Accept-Charset header of the request.
HTTP_ACCEPT_ENCODING   The contents of the HTTP Accept-Encoding header of the request.
HTTP_ACCEPT_LANGUAGE   The contents of the HTTP Accept-Language header of the request.
HTTP_AUTHORIZATION   The contents of the HTTP Authorization header of the request. It will only be available if the Raw user info variable has been set to Yes by the server administrator.
HTTP_CACHE_CONTROL   Information about how to handle the caching od the object requested.
HTTP_CONNECTION   A lowercased version of the HTTP Connection header; typically keep-alive.
HTTP_COOKIE   If you've set a cookie, this holds its value.
HTTP_FORWARDED   An old variant of the Via: header.
HTTP_FROM   The email address of the user making the request. Most browsers do not support this variable.
HTTP_HOST   The net_loc part of the URL, as sent in the HTTP Host header, for instance localhost:4711.
HTTP_PRAGMA   If the client sent any pragma header(s), they are provided here. For practical purposes, the only pragma header you are likely to encounter is no-cache, which some browsers (Netscape comes to mind) send when the user reloads the page.
HTTP_PROXY_CONNECTION   The contents of the HTTP Proxy-Connection header of the request.
HTTP_REFERER   The URL of the document that the client points to before accessing the CGI program.
HTTP_UA_PIXELS   The screen resolution of the client.
HTTP_UA_COLOR   The color information of the client.
HTTP_UA_OS   The operating system used by the client.
HTTP_UA_CPU   The processor type used by the client.
HTTP_USER_AGENT   The browser the client is using to issue the request.
HTTP_VIA   Information about the proxy servers eventually used for making the request.
HTTPS   Returns 'true' if the server is secure.
INDEX   The query part of the URL, if present.
LAST_MODIFIED   Last modification date and time for current file.
PAGE_COUNT   Number of accesses to current document since server was brought on line.
PATH   The system path your system is running on.
PATH_INFO   Extra path information passed to a CGI program.
PATH_TRANSLATED   The translated version of the path given by the variable PATH_INFO.
PRESTATE_name   The value true if that prestate was present.
PRESTATES   If server found prestates in the URL, this is a space-separated array of those present.
PRINTENV   A special XSSI command which returns ALL environment variables, including those which have been set within the page. Note that, like flastmod and fsize, it is a directive in itself and does not require 'echo var=' in its argument.
QUERY_name   The value of the form variable name.
QUERY_STRING   The query information passed to the program. It is appended to the URL with a "?".
QUERY_STRING_UNESCAPED   Undecoded query string with all shell metacharacters escaped with "\".
REDIRECT_SCRIPT_NAME   The virtual path of the parent document.
REDIRECT_STATUS   The status code of the parent request. It is useful when writing scripts that generate custom error pages.
REMOTE_ADDR   The remote IP address of the user making the request.
REMOTE_HOST   The remote hostname of the user making the request.
REMOTE_IDENT   The user making the request. This variable will only be set if NCSA IdentityCheck flag is enabled, and the client machine supports the RFC 931 identification scheme (ident daemon).
REMOTE_PASSWORD   The password used by the user, only available if the Send decoded password variable is set to Yes by the administrator and the client authenticated itself.
REMOTE_PORT   The port number used by the client.
REMOTE_USER   The authenticated name of the user.
REQUEST_METHOD   The method with which the information request was issued.
REQUEST_URI   The address of the requested document or CGI file, relative to the document root.
SCRIPT_FILENAME   The complete path in the real file system to the CGI script.
SCRIPT_NAME   The virtual path (e.g., /cgi-bin/ of the script being executed.
SCRIPT_URI   The absolute URL of the CGI script called.
SCRIPT_URL   The URL path of the CGI script called.
SERVER_ADDR   The server's DNS address.
SERVER_ADMIN   The e-mail address of your server's webmaster.
SERVER_NAME   The server's hostname or IP address.
SERVER_PORT   The port number of the host on which the server is running.
SERVER_PROTOCOL   The name and revision of the information protocol the request came in with.
SERVER_SIGNATURE   Used server error messages.
SERVER_SOFTWARE   The name and version of the server software that is answering the client request.
SERVER_URL   The URL to the web server. Together with SCRIPT_NAME, this makes up the complete URL for the script.
SUPPORTS   A list of words, separated with spaces, of all features for which support information is available.>
SUPPORTS_feature   The value true if that feature is supported by the current browser.
TOTAL_HITS   Total pages served by server since brought on line.
TZ   Time zone.
UNIQUE_ID   Serial no. of the server.
USER_INFO   Identity of current site as known by the server.
USER_NAME   The name of the user who started Apache.
VAR_name   The value of the form variable name.
VARIABLES   A list of all form variables.
WANTS_name   The value true if that server configuration option was set. See also CONFIGS.
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