| AUTH_TYPE | | client authorization method |
| CONTENT_LENGTH | | size of input posted from client |
| CONTENT_TYPE | | MIME type of content |
| DATE_GMT | | current GMT |
| DATE_LOCAL | | current local time and date |
| DOCUMENT_NAME | | document name that was requested |
| DOCUMENT_URL | | URL of the document |
| LAST_MODIFIED | | document modified date |
| PAGE_COUNT | | number of accesses to current document since server was brought on line |
| HTTP_REFERER | | URL of the document the client came from |
| HTTP_USER_AGENT | | ID string of web browser |
| REMOTE_ADDR | | numeric IP address of the client |
| REMOTE_HOST | | domain name of the client (if reverse lookup turned on) |
| REMOTE_USER | | ID of user, rarely ever found |
| REQUEST_METHOD | | HTTP method: GET OR POST |
| SERVER_NAME | | server hostname |
| SERVER_PORT | | the port used by httpd |
| SERVER_PROTOCOL | | version of httpd compliance |
| SERVER_SOFTWARE | | name of the server software |
| TOTAL_HITS | | total number of pages served by server since brought on line |