expires off not applying

[Erik Karulf]

Hello All!
I am relatively new nginx user (~ 3 months), a convert from the lighttpd
camp.
I have been very happy with the elegance and power behind nginx and I am in
the process of converting all of the servers in our cluster to
nginx/apache/mongrel (from lighttpd and scgi)

Anyway, here is my problem.
The environment is FreeBSD 6.2 running on AMD 64
I have nginx 0.5.11 setup to forward PHP requests to apache 1.3 (bound to
127.0.0.1:8080)  while serving static files locally using sendfile(2)

Nginx seems to be modifying the expiration and cache control headers when I
go to /, yet eerily enough it leaves them alone if you go to /index.php.
Here are the associated http response headers:

For /
  Server    nginx/0.5.11
  Date    Mon, 16 Apr 2007 13:04:12 GMT
  Content-Type    text/html; charset=ISO-8859-1
  Transfer-Encoding    chunked
  Connection    keep-alive
  X-Powered-By    PHP/5.2.1
  Expires    Wed, 16 May 2007 13:04:12 GMT
  Cache-Control    max-age=2592000
  Pragma    no-cache
  Content-Encoding    gzip

For /index.php
  Server    nginx/0.5.11
  Date    Mon, 16 Apr 2007 13:05:14 GMT
  Content-Type    text/html; charset=ISO-8859-1
  Transfer-Encoding    chunked
  Connection    keep-alive
  X-Powered-By    PHP/5.2.1
  Expires    0
  Cache-Control    private, post-check=0, pre-check=0, max-age=0
  Pragma    no-cache
  Content-Encoding    gzip

I have attached my nginx.conf below. Also if you have any optimization
recommendations, please let me know.
Thanks for the help!

-Erik Karulf

nginx.conf>>EOF
user  www;
worker_processes  1;
#pid        logs/nginx.pid;

events {
  worker_connections  8192;
  use kqueue;
}


http {
  include       mime.types;
  default_type  application/octet-stream;
  access_log        off;
  error_log         off;
  sendfile          on;
  tcp_nopush        on;
  tcp_nodelay       on;

  keepalive_timeout 65;
  server_names_hash_bucket_size 128; # this seems to be required for vhosts

  gzip              on;
  gzip_min_length   1100;
  gzip_buffers      4 8k;
  gzip_http_version 1.0;
  gzip_comp_level   2;
  gzip_proxied      any;
  gzip_types        text/plain text/html text/css application/x-javascript
text/xml application/xml application/xml+rss text/javascript;

  proxy_redirect           off;
  proxy_set_header         Host $host;
  proxy_set_header         X-Real-IP $remote_addr;
  proxy_set_header         X-Forwarded-For $proxy_add_x_forwarded_for;
  client_max_body_size     10m;
  client_body_buffer_size  128k;
  proxy_connect_timeout    90;
  proxy_send_timeout       90;
  proxy_read_timeout       90;
  proxy_buffer_size        4k;
  proxy_buffers            4 32k;
  proxy_busy_buffers_size  64k;
  proxy_temp_file_write_size  64k;


  # http://forums.example.com <http://forums.penny-arcade.com/>
  server {
     listen         80;
     server_name    forums.example.com <http://forums.penny-arcade.com/>;

     location / {
        root   /www/forums.example.com/ <http://arcade.com/>;
        index  index.html index.htm index.php;

        if ($request_filename !~* "^.+.(php|php3)$") {
           root   /www/forums.example.com/ <http://arcade.com/>;
           expires    30d;
           break;
        }
        expires    off;
        proxy_pass http://127.0.0.1:8080/;
     }

     location = /clear.gif {
        empty_gif;
        expires     30d;
     }
  }
}
EOF
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