nginx upload client max body size issue

Question

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

User · Answer

Does your upload die at the very end  99  before crashing  Client body and buffers are key because nginx must buffer incoming data  The body configs  data of the request body  specify how nginx handles the bulk flow of binary data from multi-part-form clients into your app s logic   The clean setting frees up memory and consumption limits by instructing nginx to store incoming buffer in a file and then clean this file later from disk by deleting it   Set body in file only to clean and adjust buffers for the client max body size  The original question s config already had sendfile on  increase timeouts too  I use the settings below to fix this  appropriate across your local config  server   amp  http contexts    client body in file only clean  client body buffer size 32K   client max body size 300M   sendfile on  send timeout 300s

User · Answer

nginx  fails fast  when the client informs it that it s going to send a body larger than the client max body size by sending a 413 response and closing the connection   Most clients don t read responses until the entire request body is sent   Because nginx closes the connection  the client sends data to the closed socket  causing a TCP RST   If your HTTP client supports it  the best way to handle this is to send an Expect  100-Continue header   Nginx supports this correctly as of 1 2 7  and will reply with a 413 Request Entity Too Large response rather than 100 Continue if Content-Length exceeds the maximum body size

User · Answer

From the documentation      It is necessary to keep in mind that the browsers do not know how to correctly show this error    I suspect this is what s happening  if you inspect the HTTP to-and-fro using tools such as Firebug or Live HTTP Headers  both Firefox extensions  you ll be able to see what s really going on

[http] nginx upload client_max_body_size issue

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