Passing All Directories To Express Using Nginx - node.js

Question

I'm trying to pass through all the directories in my app through to express, and in some cases directories that contain a dynamic 'key' which I'll :capture.
I can't get even a defined sub-directory, /pretest, to pass through to express. Despite copying the the same options for Location /, it serves me an Ngxin 404
Ideally, I want domain.com/prepop/{lookup_key} to pass to localhost:8080/prepop/{lookup_key}
Where {lookup_key} is a different value each time
Any ideas what I'm doing wrong here? Any/all help is much appreciated.
Code-
server.js
const path = require('path');
const express = require("express");
const mysql = require('mysql2');
const cors = require("cors")
const port = process.env.PORT || 8080;
const app = express();
app.use(cors())
app.get('/', (req, res) => {
res.send('hello');
});
app.get('/pretest', (req, res) => {
res.send('test');
});
app.get('/prepop/:lookup_key', (req, res) => {
let connection = mysql.createConnection({
//commented out for stackoverflow
});
connection.connect();
connection.query('SELECT * FROM table_incoming_leads WHERE leadid = '+req.params.send_key, (err, response, fields) => {
if (err) console.log(err);
res.json({
email: response[0].email,
first_name: response[0].first_name,
last_name: response[0].last_name
})
});
connection.end();
})
app.listen(port, () => console.log(`Server listening on port ${port}`));
/etc/nginx/sites-available/default
server {
root /var/www/html;
location / {
proxy_pass http://localhost:8080/;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
try_files $uri $uri/ =404;
}
location /pretest {
proxy_pass http://localhost:8080;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
try_files $uri $uri/ =404;
}
location /prepop {
proxy_pass http://localhost:8080/;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
try_files $uri $uri/ =404;
}
listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/subdomain.mydomain.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/subdomain.mydomain.com/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
if ($host = subdomain.mydomain.com) {
return 301 https://$host$request_uri;
} # managed by Certbot
listen 80 ;
listen [::]:80 ;
server_name subdomain.mydomain.com;
return 404; # managed by Certbot
}

Answer 1

You need to remove try_files directive from /prepop location because when nginx receives a request for let's say /prepop/somekey it looks for a file with that name (somekey) in your root directory. Since there is no such file it returns 404.