change nginx response code from 413 - nginx

Question

Is there any way to change the response code nginx sends? When the server receives a file that exceeds its client_max_body_size as defined in the config, can I have it return a 403 code instead of a 413 code?

Answer 1

Below works fine for me
events {
worker_connections 1024;
}
http {
server {
listen 80;
location #change_upload_error {
return 403 "File uploaded too large";
}
location /post {
client_max_body_size 10K;
error_page 413 = #change_upload_error;
echo "you reached here";
}
}
}
Results for posting a 50KB file
$ curl -vX POST -F file=#test.txt vm/post
Note: Unnecessary use of -X or --request, POST is already inferred.
* Trying 192.168.33.100...
* TCP_NODELAY set
* Connected to vm (192.168.33.100) port 80 (#0)
> POST /post HTTP/1.1
> Host: vm
> User-Agent: curl/7.54.0
> Accept: */*
> Content-Length: 51337
> Expect: 100-continue
> Content-Type: multipart/form-data; boundary=------------------------67df5f3ef06561a5
>
< HTTP/1.1 403 Forbidden
< Server: openresty/1.11.2.2
< Date: Mon, 11 Sep 2017 17:58:55 GMT
< Content-Type: text/plain
< Content-Length: 23
< Connection: close
<
* Closing connection 0
File uploaded too large%
and nginx logs
web_1 | 2017/09/11 17:58:55 [error] 5#5: *1 client intended to send too large body: 51337 bytes, client: 192.168.33.1, server: , request: "POST /post HTTP/1.1", host: "vm"
web_1 | 192.168.33.1 - - [11/Sep/2017:17:58:55 +0000] "POST /post HTTP/1.1" 403 23 "-" "curl/7.54.0"