October 2008
Intermediate to advanced
204 pages
3h 2m
English
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Appendix B. CGI Environment Variables
Standard CGI Variables
Note that variables not defined by the CGI specification are marked with a star (
). In addition, HTTP request header field values are added to the environment with the prefix HTTP_, and any hyphens in the header field name are changed to underscores (the Authorization and Proxy-Authorization headers are omitted for security reasons).
AUTH_TYPEAuthentication method used (only if request is subject to authentication)
CONTENT_LENGTHLength of the entity body (for POST requests)
CONTENT_TYPEMIME type of the entity body (for POST requests)
DOCUMENT_ROOTValue of the
DocumentRootdirective.GATEWAY_INTERFACECGI version
PATH_INFOURL part after script identifier (if present)
PATH_TRANSLATEDPATH_INFOtranslated into filesystemQUERY_STRINGQuery string from URL (if present)
REMOTE_ADDRIP address of client
REMOTE_HOSTDNS name of client (if resolved)
REMOTE_IDENTRemote user ID (unreliable, even if available)
REMOTE_USERName of the authenticated user (only if request is subject to authentication)
REQUEST_METHODHTTP request method
REQUEST_URIURI of the request from the HTTP request line
SCRIPT_FILENAMEFull pathname of the script
SCRIPT_NAMEVirtual path of ...
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