Upstream prematurely closed connection while reading response header from upstream

Question

Problem :

Currently I am using the nginx and node server to serve the update requests. I often face the gateway timeout whenever I request an update on large data. I saw below error from the nginx error logs as below :

2019/04/07 00:46:04 [error] 28599#0: *1 upstream prematurely closed connection while reading response header from upstream, client: 10.0.2.77, server: gis.oneconcern.com, request: "GET /update_mbtiles/atlas19891018000415 HTTP/1.1", upstream: "http://127.0.0.1:7777/update_mbtiles/atlas19891018000415", host: "gis.oneconcern.com"

I tried everything that I could, but I still I face the same error.

The nginx configuration has below proxy settings :

    #############

    # Proxy settings

    #############

    proxy_connect_timeout 1000;

    proxy_send_timeout 1000;

    proxy_read_timeout 1000;

    send_timeout 1000;

 

I am trying to use the nodejs backend to serve the requests on an aws server. My gateway error shows up only when a update takes the long time around 3-4 minutes. Please note I do not get the error for smaller updates. Please let me know how can I resolve the issue.

Answer 1

I also had the same error for quite a while in recent past, and below is what fixed it for me.

I just declared in service that i use what is given below :

Description= The node service description

After= network.target

[Service]

Type=forking

PIDFile=/tmp/node_pid_name.pid

Restart=on-failure

KillSignal=SIGQUIT

WorkingDirectory=/path/to/your /node/app/root/directory

ExecStart=/path/to/your/node /path/to/server.js

[Install]

WantedBy=multi-user.target

Please note "After=network.target". I spent many days looking for the fixes on nginx side, while my problem was just that. To be very sure just stop running the node service you have and  launch the ExecStart command directly and try to just reproduce the bug. If it does not show up, it clearly means that your service has all the problems. This is how I found my answer.