I have setup Nginx proxy to a Netty server. I am seeing a timeout from upstream, i.e. Netty. The consequence of this timeout is that the JSON payload response is truncated (as seen on browser developer tools)

2015/07/21 05:08:56 [error] 6#0: *19 upstream prematurely closed connection while reading upstream, client: 198.147.191.15, server: sbox-wus-ui.cloudapp.net, request: "GET /api/v1/entities/DEVICE HTTP/1.1", upstream: "http://10.0.3.4:8080/api/v1/entities/DEVICE", host: "sbox-wus-ui.cloudapp.net", referrer: "https://sbox-wus-ui.cloudapp.net/home.html"

So, yes I initially thought that this is a Netty issue. However, when I make the same API call on Netty I am able to the retrieve the full JSON payload.

The JSON response message size is about 13k. The JSON response I see on the Nginx side is 10K. After spending some time reading up on the Nginx configuration parameters, I added client_body_temp and proxy_temp but to no avail. Any help is really appreciated.

Nginx details:

nginx version: nginx/1.8.0
built by gcc 4.8.2 20140120 (Red Hat 4.8.2-16) (GCC)
built with OpenSSL 1.0.1e-fips 11 Feb 2013
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --with-http_spdy_module --with-cc-opt='-O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'

-----

# For more information on configuration, see:
# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes 1;
daemon off;

error_log {{logDir}}/error.log;

pid /run/nginx.pid;


events {
worker_connections 1024;
}


http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';

access_log {{logDir}}/access.log main;

sendfile on;
#tcp_nopush on;

#keepalive_timeout 0;
keepalive_timeout 65;

chunked_transfer_encoding off;

# Disable constraints on potential large uploads resulting in HTTP 413 #
client_max_body_size 0;

#gzip on;

index index.html index.htm;

upstream netty { {% for netty in servers %}
server {{netty}}; {% endfor %}
}

# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;

server {
listen 80;
server_name {{serverName}};
rewrite ^ https://$server_name$request_uri? permanent;
}

server {
listen 443 ssl;
server_name {{serverName}};
ssl_certificate /data/nginx/cert/{{crtFile}};
ssl_certificate_key /data/nginx/cert/{{keyFile}};

root /usr/share/nginx/html;

#charset koi8-r;

#access_log /var/log/nginx/host.access.log main;

# Load configuration files for the default server block.
include /etc/nginx/default.d/*.conf;

#The only resource available to check health
location /health {
root /apps/nginx/f2;
index index.html;
}

location / {
client_body_buffer_size 128k;

client_body_temp_path /apps/nginx/client_body_temp;

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;
proxy_temp_path /apps/nginx/proxy_temp;
root /apps/nginx/f2;
index index.html;
{% if basicAuth == "true" %}
auth_basic "Restricted";
auth_basic_user_file /data/nginx/cert/htpasswd;
{% endif %}
}

location /ui/ {
proxy_pass http://netty;
{% if basicAuth == "true" %}
auth_basic "Restricted";
auth_basic_user_file /data/nginx/cert/htpasswd;
{% endif %}
}

location /api/ {
proxy_pass http://netty;
}

location /sales/ {
root /apps/nginx/f2;
index index.html;
{% if basicAuth == "true" %}
auth_basic "Restricted";
auth_basic_user_file /data/nginx/cert/htpasswd;
{% endif %}
}


# redirect server error pages to the static page /40x.html
#
error_page 404 /404.html;
location = /40x.html {
}

# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
}
}
}