Dear Yutaka,
 
when using delegate 9.7.7 as a http origin server, it seems that the 304
(not modified) response does not conform exactly to the http
specifiation:

	HTTP/1.1 304 Not modified
	Date: Wed, 12 Dec 2007 10:43:46 GMT
	Server: DeleGate/9.7.7
	DeleGate-Ver: 9.7.7 (delay=7)
	MIME-Version: 1.0
	Content-Type: image/jpeg
	Content-Length: 2791
	Last-Modified: Wed, 28 Nov 2007 02:40:56 GMT
	Proxy-Connection: keep-alive, timeout=50, maxreq=48
	
	=> "This type of HTTP response MUST NOT contain a body, but a
non-zero content-length was returned."

Apache sends a much shorter response like this:

	HTTP/1.1 304 Not Modified
	Date: Wed, 12 Dec 2007 10:59:18 GMT
	Server: Apache/2.2.3 (Linux/SUSE)
	Connection: close

 
I do not think that the header will cause any problems, I just wanted to
let you know.
 
With kind regards,
Matthias