uwsgi uwsgi flask app and nginx gives 404 not found - nginx

Question

I got stuck. I want to deploy python dash app on my vps. I started with flask app following this tutorial:
https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-uswgi-and-nginx-on-ubuntu-18-04
So I created service myproject. Checking status seems to be ok:
My nginx configuration:
server {
listen 443 ssl http2;
#listen [::]:443 ssl http2;
server_name www.mysite.com mysite.com;
root /var/www/wordpress;
index index.php;
access_log /var/log/nginx/wordpress.log;
error_log /var/log/nginx/wordpress_error.log error;
ssl_certificate_key /etc/nginx/ssl/www.XXX.key;
ssl_certificate /etc/nginx/ssl/www.XXX.pem;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
ssl_prefer_server_ciphers off;
add_header Strict-Transport-Security max-age=31536000;
location / {
try_files $uri $uri/ =404;
}
location ~ \.php$ {
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
}
location /shiny/ {
rewrite ^/shiny/(.*)$ /$1 break;
proxy_pass http://127.0.0.1:3838;
proxy_redirect http://127.0.0.1:3838 $scheme://$host/shiny/;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_temp_file_write_size 64k;
proxy_connect_timeout 10080s;
proxy_send_timeout 10080;
proxy_read_timeout 10080;
proxy_buffer_size 64k;
proxy_buffers 16 32k;
proxy_busy_buffers_size 64k;
proxy_redirect off;
proxy_request_buffering off;
proxy_buffering off;
}
location /rstudio/ {
rewrite ^/rstudio/(.*)$ /$1 break;
proxy_pass http://127.0.0.1:8787;
proxy_redirect http://127.0.0.1:8787 $scheme://$host/rstudio/;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
#proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_http_version 1.1;
#proxy_redirect off;
proxy_buffering off;
#proxy_set_header Upgrade $http_upgrade;
#proxy_set_header Connection "upgrade";
proxy_read_timeout 86400;
}
location /myproject/ {
uwsgi_pass unix:/home/XXX/XXX/python_dash/myproject/myproject.sock;
include uwsgi_params;
}
}
But when i go to mysite.com/myproject/ I get:
However it's diffrent than regular nginx (appearing in response to misspelling):
So something is going on. Its also visible on myproject service status. Every time when I try to access it it shows a line at the bottom:
[pid: 1696|app: 0|req: 1/1] 213.134.X.XX () {58 vars in 1334 bytes} [Fri Dec 3 13:22:08 2021] GET /myproject/ => generated 232 bytes in 40 msecs (HTTP/2.0 404) 2 headers in 87 bytes (2 switches on core 0)
my myproject.ini:
[uwsgi]
module = wsgi:app
master = true
processes = 5
socket = myproject.sock
chmod-socket = 666
vacuum = true
die-on-term = true
Can you give me a hint? I got stuck on that and cant solve it...
Best regards
Tomasz

Answer 1

Finally found it!
#app.route must match with location in nginx config
so in my case when:
location /myproject/
app route must be:
#app.route("/myproject/")
Remember about trailing "/" because if you don't add it it will return not found if you type trailing "/" in address bar (like https://website.com/myproject/ will not work, only https://website.com/myproject)
Similar thing is with python dash, but this time #app.route (or #server.route) doesn't work. You need to add routes_pathname_prefix="/myproject/" in dash.Dash(...).
I don't understand why it works that way, but it works.