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# Remove HTTP_COOKIE. It is a security risk to have students see the IVLE
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# cookie of their visitors.
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# Remove DOCUMENT_ROOT and SCRIPT_FILENAME. Not part of CGI spec and
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# exposes unnecessary details about server.
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# Remove PATH. The PATH here is the path on the server machine; not useful
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# inside the jail. It may be a good idea to add another path, reflecting
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# the inside of the jail, but not done at this stage.
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# Remove SCRIPT_FILENAME. Not part of CGI spec (see SCRIPT_NAME).