nginx reverse proxy fails for post/get requests - node.js

Question

I'm trying to set up a reverse proxy using nginx for a nodejs application. My node application currently runs on port 8005 of the example.com server. Running the application and going to example.com:8005 the application works perfect. But When I tried to set up nginx my application seems to work at first by going to example.com/test/ but when I try and post or get requests the request wants to use the example.com:8005 url and I end up with a cross origin error, CORS. I would like to have the request url reflect the nginx url but I'm having no luck getting there. Below is my nginx default.conf file.
server {
listen 80;
server_name example;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
location /test/ {
proxy_pass http://localhost:8005/;
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;
}
}

Answer 1

There got to be some way to tell nginx about whichever app you are using.
So for that, either you can prefix all the apis with say test(location /test/api_uri), and then catch all the urls with prefix /test and proxy_pass them to node, or if there is some specific pattern in your urk, you can catch that pattern with regex, like suppose, all the app1 apis contain app1 somewhere in it, then catch those urls using location ~ /.*app1.* {} location ~ /.*app2.*, make sure that you maintain the order of location.
Demo Code :
server {
...
location /test {
proxy_pass http://localhost:8005/; #app1
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;
}
location /test2 {
proxy_pass http://localhost:8006/; #app2
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;
}
...
}
Other Demo for regex,
server {
...
location ~ /.*app1.* {
proxy_pass http://localhost:8005/; #app1
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;
}
location ~ /.*app2.* {
proxy_pass http://localhost:8006/; #app2
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;
}
...
}