The site seems to require the Referer
header:
wget --post-file=cboe_form_data.txt \
--header='Referer: http://www.cboe.com/DelayedQuote/QuoteTableDownload.aspx' \
http://www.cboe.com/DelayedQuote/QuoteTableDownload.aspx
With this command the "QuoteData.dat" GET
request will feature the Referer
header. Response code for that request is 200
and the CSV is included.
When the Referer
header isn't present the "QuoteData.dat" GET
request returns code 302
and an "Object moved" HTML page. In that case client is sent back to "QuoteTableDownload.aspx".