nginx & Range header & proxy cache

[Richard Kearsley]

Hi
If a Range request is sent to nginx proxy (e.g. header "Range: bytes=50-") and the file isn't in cache yet (cache MISS), the range is ignored and full file sent
When the file has been cached (cache HIT), Range request works as expected

Is this the intended behaviour?

Please consider the following example

# /usr/local/nginx/sbin/nginx -V
nginx: nginx version: nginx/1.0.6
nginx: built by gcc 4.4.5 (Debian 4.4.5-8)
nginx: configure arguments:

error_log  logs/error-small.log;
worker_processes  2;
events
{
    use epoll;
    worker_connections  16384;
}

http
{
        include       mime.types;
        default_type  application/octet-stream;
        keepalive_timeout  65;
        proxy_cache_path /var/cache/nginx  levels=2:2:2  keys_zone=small:512m inactive=24h max_size=128G;
        resolver 8.8.8.8;

        server
        {
                listen       80;
                server_name  _;
                location /
                {
                        proxy_pass         http://$http_X_Backend:$http_X_Backend_Port;
                        proxy_cache        small;
                        proxy_cache_valid  200 302  10y;
                        proxy_cache_valid  404      10m;
                        proxy_cache_key         $uri;
                        proxy_cache_min_uses    10;
                        proxy_cache_use_stale updating;
                        add_header X-Cached $upstream_cache_status;
                }
                error_page   500 502 503 504  /50x.html;
                location = /50x.html
                {
                        root   html;
                }
        }
}


# wget -SO /dev/null --header="X-Backend: download.thinkbroadband.com" --header="X-Backend-Port: 80" --header="Range: bytes=50-" localhost/5MB.zip
--2011-09-13 11:33:45--  http://localhost/5MB.zip
Resolving localhost... ::1, 127.0.0.1
Connecting to localhost|127.0.0.1|:80... connected.
HTTP request sent, awaiting response...
  HTTP/1.1 200 OK
  Server: nginx/1.0.6
  Date: Tue, 13 Sep 2011 10:33:45 GMT
  Content-Type: application/zip
  Connection: keep-alive
  Last-Modified: Mon, 02 Jun 2008 15:30:42 GMT
  ETag: "11f000b-500000-44eb0adaf4c80"
  Accept-Ranges: bytes
  Content-Length: 5242880
  X-Cached: MISS
Length: 5242880 (5.0M) [application/zip]
Saving to: `/dev/null'

(try 9 more times to get it cached)

# wget -SO /dev/null --header="X-Backend: download.thinkbroadband.com" --header="X-Backend-Port: 80" --header="Range: bytes=50-" localhost/5MB.zip
--2011-09-13 11:33:11--  http://localhost/5MB.zip
Resolving localhost... ::1, 127.0.0.1
Connecting to localhost|127.0.0.1|:80... connected.
HTTP request sent, awaiting response...
  HTTP/1.1 206 Partial Content
  Server: nginx/1.0.6
  Date: Tue, 13 Sep 2011 10:33:11 GMT
  Content-Type: application/zip
  Content-Length: 5242830
  Connection: keep-alive
  Last-Modified: Mon, 02 Jun 2008 15:30:42 GMT
  ETag: "11f000b-500000-44eb0adaf4c80"
  X-Cached: HIT
  Content-Range: bytes 50-5242879/5242880
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