nginx upload client_max_body_size issue

I'm running nginx/ruby-on-rails and I have a simple multipart form to upload files. Everything works fine until I decide to restrict the maximum size of files I want uploaded. To do that, I set the nginx _`client_max_body_size`_ to _1m_ (1MB) and expect a HTTP 413 (Request Entity Too Large) status in response when that rule breaks. **The problem** is that when I upload a 1.2 MB file, instead of displaying the HTTP 413 error page, the browser hangs a bit and then dies with a "Connection was reset while the page was loading" message. I've tried just about every option there is that nginx offers, nothing seems to work. Does anyone have any ideas about this? Here's my nginx.conf: worker_processes 1; timer_resolution 1000ms; events { worker_connections 1024; } http { passenger_root /the_passenger_root; passenger_ruby /the_ruby; include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server { listen 80; server_name www.x.com; client_max_body_size 1M; passenger_use_global_queue on; root /the_root; passenger_enabled on; error_page 404 /404.html; error_page 413 /413.html; } } **Thanks.** --- **`**Edit**`** Environment/UA: Windows XP/Firefox 3.6.13