nginx to nginx proxy header problem.

[Igor Sysoev]

On Fri, Mar 06, 2009 at 06:12:55AM +0100, Jauder Ho wrote:

> I have nginx proxying to nginx+fcgi and it looks like the Vary header is
> being set twice. The reason for this config is that I intend to stick a
> Varnish instance in between but wanted to make sure this was working
> before.
> 
> Both instances have pretty much the same config.
> 
> >From the frontend instance:
> curl -I http://shop.carumba.org
> HTTP/1.1 200 OK
> Server: Hai
> Date: Fri, 06 Mar 2009 05:02:38 GMT
> Content-Type: text/html; charset=UTF-8
> Connection: keep-alive
> Vary: Accept-Encoding
> Vary: Accept-Encoding
> Set-Cookie: frontend=a5c6d3165679d1abdbc173205f2239da; expires=Fri, 06
> Mar 2009 06:02:38 GMT; path=/; domain=shop.carumba.org; HttpOnly
> Expires: Thu, 19 Nov 1981 08:52:00 GMT
> Cache-Control: no-store, no-cache, must-revalidate, post-check=0,
> pre-check=0
> Pragma: no-cache
> 
> 
> >From the backend instance:
> HTTP/1.1 200 OK
> Server: Hai
> Date: Fri, 06 Mar 2009 05:02:56 GMT
> Content-Type: text/html; charset=UTF-8
> Connection: keep-alive
> Vary: Accept-Encoding
> Set-Cookie: frontend=9e9f8cb77126971bb0798fa7324bda30; expires=Fri, 06
> Mar 2009 06:02:55 GMT; path=/; domain=shop.carumba.org; HttpOnly
> Expires: Thu, 19 Nov 1981 08:52:00 GMT
> Cache-Control: no-store, no-cache, must-revalidate, post-check=0,
> pre-check=0
> Pragma: no-cache
> 
> 
> As you can see, there is an additional Vary: header for some odd reason.
> 
> 
> 
> For completeness, the following are responses for a static file.
> a001:/usr/local/nginx/conf/carumba$ curl -I --compressed
> http://shop.carumba.org/skin/frontend/default/blank/css/reset.css
> HTTP/1.1 200 OK
> Server: Hai
> Date: Fri, 06 Mar 2009 05:10:36 GMT
> Content-Type: text/css
> Last-Modified: Wed, 18 Feb 2009 07:22:32 GMT
> Connection: keep-alive
> Vary: Accept-Encoding
> Expires: Thu, 31 Dec 2037 23:55:55 GMT
> Cache-Control: max-age=315360000
> Content-Encoding: gzip
> 
> a001:/usr/local/nginx/conf/carumba$ curl -I
> http://shop.carumba.org/skin/frontend/default/blank/css/reset.css
> HTTP/1.1 200 OK
> Server: Hai
> Date: Fri, 06 Mar 2009 05:10:49 GMT
> Content-Type: text/css
> Content-Length: 2834
> Last-Modified: Wed, 18 Feb 2009 07:22:32 GMT
> Connection: keep-alive
> Vary: Accept-Encoding
> Expires: Thu, 31 Dec 2037 23:55:55 GMT
> Cache-Control: max-age=315360000
> Accept-Ranges: bytes
> 
> 
> This is with nginx 0.7.38

You should remove
  gzip on;
on one of the nginxes. Or add
  gzip_vary  off;


-- 
Igor Sysoev
http://sysoev.ru/en/