Pass in "Accept:" (ie a header with no contents to the right of the colon) with CURLOPT_HTTPHEADER. Like:
$headers = array( "Accept:" );
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
The equivalent using the curl command line tool is:
curl -H 'Accept:' http://example.com/
This will make curl remove the header, not just send a header with a blank value. You can also send a header with a blank value if you want, but then you need to use a semicolon instead of colon!
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