After conducting thorough research on the topic following the formulation of this question, it has come to my attention that there are numerous queries similar to mine. However, I firmly believe the issue at hand here is distinct:
No 'Access-Control-Allow-Origin' - Node / Apache Port Issue
We encounter the Access-Control-Allow-Origin CORS error exclusively when initiating a substantial request:
Access to XMLHttpRequest at '.*****.es/xxxxxx' from origin '.*******.es' has been obstructed by the CORS policy: The requested resource lacks the 'Access-Control-Allow-Origin' header
All other requests function correctly, even though I attempted to configure:
app.use((req, res, next) => {
res.header('Access-Control-Allow-Origin', '*');
next();
});
without any success in resolving the error we're encountering.
I am beginning to suspect that the issue may be linked to nginx.
The current architecture we employ comprises of:
- NodeJs, Expressjs
Middlewares:
const LIMIT = '100mb'; const global = () => [ morganMiddleware(), compression(), cors(), bodyParser.urlencoded({ extended: true, limit: LIMIT }), bodyParser.json({ limit: LIMIT }), helmet(), ];
Server: Nginx 12.14.1
Hosted on AWS Elastic BeanStalk
If anyone possesses insights into what might transpire, ascertaining whether the root cause emanates from our nodejs server or nginx, kindly share your thoughts. We have explored several solutions and continue to investigate alternative avenues.