Server Request error ?

[Didi Supardi]

My application is running jam.py v5.

It's installed on an Ubuntu VPS.

Sometimes I get the error "Server request error." Why is that?

setting gunicorn

[Unit]

Description = gunicorn daemon for vdr pusat

After =  network.target

[Service]

User=www-data

Group=www-data

WorkingDirectory = /var/www/html/vdr_ind/

ExecStart = gunicorn --bind 0.0.0.0:8081 --workers 5 --access-logfile vdr_access.log --erro>

ExecReload= /bin/kill -s HUP $MAINPID

KillMode=mixed

TimeoutStopSec =5

PrivateTmp=true

[Install]

WantedBy = multi-user.target

setting nginx

server {

    server_name xxx.cloud-ledger.com;

    location /static/ {

        alias /var/www/html/vdr_ind/static/;

    }

    location / {

        proxy_pass http://0.0.0.0:8081;

        proxy_connect_timeout 300;

        proxy_send_timeout 300;

        proxy_read_timeout 300;

        proxy_set_header Host $host;

        proxy_set_header X-Real-IP $remote_addr;

        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_set_header X-Forwarded-Proto $scheme;

    }

}

[Drazen Babic]

This is not the question for Jam, but for Nginx and Gunicorn.

Let me put it this way, I was running Jam 5 with N applications  and never got this issue (*).

Why? Because Jam is a wsgi. And you are not running pure wsgi, but proxy with gunicorn.

This is basically running a software on top of software, on top of Python.

If u ask Gunicorn devs they would tell u its Python app with issues ;) If u ask Nginx they will blame unicorn.

Then see *.

Apache has full wsgi support. 

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[Didi Supardi]

I've used Apache server, but when I used multiple ports 8081, 8082, and 8083, it sometimes got messed up loading and saving programs and data. I switched to using Gunicorn + Nginx, and it worked fine. Sometimes I get errors like server request errors. Could it be due to the internet?

[Dean D. Babic]

Right, 

where do you actually call wsgi application in the above code?

ExecStart = gunicorn --bind 0.0.0.0:8081 --workers 5 --access-logfile vdr_access.log --erro>

In  here: https://jampy-docs.readthedocs.io/projects/V7/en/latest/how_to/deploy/how_to_do_with_gunicorn.html

it specifically says:
gunicorn wsgi

So I bet my money that you are running: server.py 8081 which is than proxied by Nginx from here:
proxy_pass http://0.0.0.0:8081

[Dean D. Babic]

Simple ChatGpt says this:
upstream gunicorn {
    server 127.0.0.1:8000;
    keepalive 32;  # Number of idle keep-alive connections to maintain
}

server {
    location / {
        proxy_pass http://gunicorn;
        proxy_http_version 1.1;           # CRITICAL: HTTP/1.1 required for keep-alive
        proxy_set_header Connection "";    # CRITICAL: Prevents "Connection: close" header

[Dean D. Babic]

Plus:

# When starting Gunicorn
gunicorn --keep-alive 5 ...  # Default is 2 seconds, increase to match Nginx

# Or in a config file
keepalive = 5  # seconds