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The web server also makes available information about the user and the server, including such things as what type of browser made the request.
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A list of environment variables available to the CGI program:
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GATEWAY_INTERFACE REMOTE_HOST
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SERVER_NAME REMOTE_ADDR
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SERVER_SOFTWARE AUTH_TYPE
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SERVER_PROTOCOL REMOTE_USER
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SERVER_PORT REMOTE_IDENT
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REQUEST_METHOD CONTENT_TYPE
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PATH_INFO CONTENT_LENGTH
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PATH_TRANSLATED HTTP_FROM
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SCRIPT_NAME HTTP_ACCEPT
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DOCUMENT_ROOT HTTP_USER_AGENT (browser)
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QUERY_STRING HTTP_REFERER
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