I don't have enough knowledge about libcurl to comment on what/how this should be done.

(1) Possible solution (that would modify behavior): If body is ignored return 304 (although the server responded 200)

(2) Naive solution: Some (new) property that gets set when this happens that can be queried

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** [bugs:#1202] Response body not parsed for OK 200 if If-Modified-Since matches Last-Modified**
**Status:** open
**Created:** Mon Mar 04, 2013 07:43 AM UTC by Niko Sams
**Last Updated:** Mon Apr 01, 2013 09:14 PM UTC
**Owner:** Daniel Stenberg
For some reason fetching the url with lastmodified options doesn't work 
correctly. The server returns a 200 OK but the response doesn't include the 
body.
to reproduce start the following php script:
    <?php 
    $sock = socket_create_listen(1234); 
    socket_getsockname($sock, $addr, $port); 
    print "Server Listening on $addr:$port\n"; 
    while($c = socket_accept($sock)) { 
        socket_getpeername($c, $raddr, $rport); 
        print "Received Connection from $raddr:$rport\n";
        $buf = '';
        do {
            $l = socket_read($c, 1024);
            $buf .= $l;
        } while (substr($buf, -4) != "\r\n\r\n");
        echo $buf."\n";
        $out = "HTTP/1.1 200 OK
    Content-Type: text/plain
    Last-Modified: Mon, 25 Feb 2013 13:35:56 GMT
    test
    ";
	$out = str_replace("\n", "\r\n", $out);
	echo $out;
	socket_write($c, $out, strlen($out));
	socket_close($c);
    } 
    socket_close($sock); 
    ?>
and try to fetch:
`curl localhost:1234 -v -z "Mon, 25 Feb 2013 13:35:56 GMT"`
Expected behavior:
body ("test") should be included in response
Actual behavior:
body is *not* included in response
Downstream bug: https://bugs.php.net/bug.php?id=64298
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