GET requests returning 404 (no replies)

Hi,

We are using Play for the backend and using NGinx to serve requests for static files from local.

Below is the config that we are using

upstream backend {
server x.x.x.x:9000;
}

server {
listen 0.0.0.0:8082;
server_name localhost;

location /client {
root /static;
expires off;
sendfile off;
}

location / {
proxy_set_header Access-Control-Allow-Origin *;
proxy_set_header 'Access-Control-Allow-Credentials' 'true';
proxy_set_header 'Access-Control-Allow-Headers' 'X-Requested-With,Accept,Content-Type, Origin';
proxy_set_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE, HEAD';

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;

proxy_pass http://backend;
proxy_redirect off;
}

}

Some requests like "GET /api/alerts" returns 404

Now here is the wierd part. When I update the configuration like below, basically copying the same config for this specific uri path, I get 200 OK back

upstream backend {
server x.x.x.x:9000;
}

server {
listen 0.0.0.0:8082;
server_name localhost;

location /client {
root /static;
expires off;
sendfile off;
}

location /api {
proxy_set_header Access-Control-Allow-Origin *;
proxy_set_header 'Access-Control-Allow-Credentials' 'true';
proxy_set_header 'Access-Control-Allow-Headers' 'X-Requested-With,Accept,Content-Type, Origin';
proxy_set_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE, HEAD';

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;

proxy_pass http://backend;
proxy_redirect off;
}

location / {
proxy_set_header Access-Control-Allow-Origin *;
proxy_set_header 'Access-Control-Allow-Credentials' 'true';
proxy_set_header 'Access-Control-Allow-Headers' 'X-Requested-With,Accept,Content-Type, Origin';
proxy_set_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, PUT, DELETE, HEAD';

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;

proxy_pass http://backend;
proxy_redirect off;
}

}

what could be the issue?