My setup (Railway internal networking names in braces):

• Symfony API backend php-fpm container, exposed default port 9000 ("capi")

• nginx-alpine container ("cproxy") configured to pass requests to php-fpm, exposed default port 80

• React/vite frontend ("cweb"), exposed default port 5173

Railway configuration

• Frontend has a VITE_API_URL env var with value https://cproxy

• nginx-alpine container has a NGINX_FASTCGI_PASS env var with value capi:9000 - start.sh script takes care of interpolating this env var into the nginx conf file

Dockerfile for nginx-alpine container

```
FROM nginx:alpine

COPY default.conf.template /etc/nginx/conf.d/default.conf.template

COPY start.sh /start.sh

RUN chmod +x /start.sh

```

default.conf.template:

```
server {

listen 80;

server_name localhost;

root /var/www/html/public;

index index.php index.html;

location / {

if ($request_method = 'OPTIONS') {

add_header 'Access-Control-Allow-Origin' '*' always;

add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;

add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;

add_header 'Access-Control-Max-Age' 1728000 always;

add_header 'Content-Type' 'text/plain; charset=UTF-8' always;

add_header 'Content-Length' 0 always;

return 204;

}

try_files $uri $uri/ /index.php?$query_string;

add_header 'Access-Control-Allow-Origin' '*' always;

add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;

add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;

}

location ~ \.php$ {

fastcgi_pass ${NGINX_FASTCGI_PASS};

fastcgi_index index.php;

fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

include fastcgi_params;

# Also apply CORS headers for PHP files

add_header 'Access-Control-Allow-Origin' '*' always;

add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;

add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;

}

error_log /var/log/nginx/project_error.log;

access_log /var/log/nginx/project_access.log;

}
```

Issues

1. The frontend is unable to communicate with nginx. Error in browser Response body is not available to scripts (Reason: CORS Missing Allow Origin).

2. If I add a public domain for the cproxy service at port 80 and browse to it, I can see the nginx welcome page. However accessing any api endpoint on the domain produces a 404.

Looking for help to get the communication working between these services. Thanks!