Reverse Proxy Cache Setup

[royo]

Ryan Malayter Wrote:
-------------------------------------------------------
> On Mon, Mar 29, 2010 at 11:44 AM, royo  wrote:
> >
> > Thanks Ryan. I don't have much control over the
> application itself, so I guess I'd need to enforce
> the caching somehow for users that are logged in
> and disable it for those that aren't from nginx.
> >
> 
> If you include a unique string in your nginx
> proxy_cache_key, then
> logged-in user requests should never be in cache
> (again, assuming the
> back-end sets cache-control headers).
> 
> So, assuming you have "proxy_cache_key
> $http_host$request_uri$http_cookie_logmein" in
> your nginx config:
> 
> A request for http://mine.example.com/foo from an
> anonymous user would
> get nginx cache key:
>    http://mine.example.com/foo   <-- logmein is
> empty
> This result could be served from cache for future
> anonymous requests
> 
> A request for http://mine.example.com/foo from a a
> logged in user user
> would get nginx cache key:
>    http://mine.example.com/fooAB324494354CD43254DC
>   <-- logmein
> contains user's session ID
> In this case, there would not be a cache hit on
> the nginx side, and a
> logged in user's request is passed to the back-end
> and they get a
> customized version of the page. No anonymous users
> would ever see that
> because they don't have that session ID.
> Presumably, the back-end must
> set "Cache-Control: private" or "Cache-Control:
> no-cache" for
> logged-in users. If it doesn't, you're really
> going to have problems.
> 
> I do not think that nginx proxy directives are
> allowed inside an "if"
> block. You might be able to use "if
> $http_cookie_logmein" to redirect
> internally to a named nginx location that does not
> have any caching.
> 
> Can you post your nginx configuration?
> 
> 
> -- 
> RPM
> 
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The app sets "Cache-Control: private" right now for everyone, and with the following setup even users that are not logged in receive a fresh copy of the page every time. The said cookie is set when logging in to the domain xyz.com(not actual domain) as well as other cookies but when using the nginx proxy only the other cookies are set and the logmein cookie isn't visible.


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

  client_body_buffer_size     128K;
  client_header_buffer_size   128K;
  client_max_body_size          1M;
  large_client_header_buffers 1 1k;

  client_body_timeout   60;
  client_header_timeout 60;
  keepalive_timeout     60 60;
  send_timeout          60;

  ignore_invalid_headers   on;
  keepalive_requests      100;
  limit_zone gulag $binary_remote_addr 5m;
  recursive_error_pages    on;

    sendfile        on;

  server_name_in_redirect off;
  server_tokens           off;
  tcp_nodelay on;
  tcp_nopush  on;

  gzip              on;
  gzip_buffers      16 8k;
  gzip_comp_level   6;
  gzip_http_version 1.0;
  gzip_min_length   0;
  gzip_types        text/plain text/css image/x-icon application/x-perl application/x-httpd-cgi;
  gzip_vary         on;


proxy_buffering           on;
     proxy_cache_path  /optimum/nginx/cache levels=1:2 keys_zone=my-cache:8m max_size=1000m inactive=600m;
    proxy_temp_path /optimum/nginx/cache/tmp;
    proxy_set_header          X-Forwarded-For $remote_addr;
proxy_redirect            off;
  proxy_connect_timeout     30;
  proxy_send_timeout        30;
  proxy_read_timeout        30;
  proxy_cache_valid         any 10m;


    server {
        listen       80;
        server_name  localhost;

        location / {

      proxy_pass http://xyz.com;
      proxy_cache my-cache;
proxy_pass_header  Set-Cookie;

proxy_cache_key $host$request_uri$http_cookie_logmein;

      proxy_cache_valid  404      1m;

            index index.php index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,69049,69144#msg-69144