id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
772	No Vary header on 304 Response.	uudruid74.startssl.com	Maxim Dounin	"Yes, I know its Tengine, but I'm betting this will be in Nginx 1.6.2 as well, as its better to fix it ""upstream"" so that everyone gets it fixed.   Tested this via RedBot.org.

Here, everything is working on regular 200 Response

    HTTP/1.1 200 OK
    Server: Tengine
    Date: Sun, 05 Jul 2015 06:45:18 GMT
    Content-Type: text/html; charset=UTF-8
    Last-Modified: Sun, 05 Jul 2015 03:15:13 GMT
    Transfer-Encoding: chunked
    Connection: keep-alive
    Vary: Accept-Encoding
    Expires: Sun, 12 Jul 2015 06:45:18 GMT
    Cache-Control: max-age=604800
    Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
    X-Content-Type-Options: nosniff
    Content-Encoding: gzip


Now, the Vary header is gone (and I'm pretty sure it should be there for this response)

HTTP/1.1 304 Not Modified
    Server: Tengine
    Date: Sun, 05 Jul 2015 06:45:18 GMT
    Last-Modified: Sun, 05 Jul 2015 03:15:13 GMT
    Connection: keep-alive
    ETag: ""5598a141-5eb""
    Expires: Sun, 12 Jul 2015 06:45:18 GMT
    Cache-Control: max-age=604800
    Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
    X-Content-Type-Options: nosniff"	defect	assigned	minor		nginx-core	1.9.x		Vary		"Linux navi 2.6.32-042stab108.2 #1 SMP Fri Jun 19 19:47:59 2015 x86_64 Intel(R) Xeon(R) CPU X5670 @ 2.93GHz GenuineIntel GNU/Linux
"	"Tengine version: Tengine/2.1.0 (nginx/1.6.2)
TLS SNI support enabled"