Error 502 between multiple projects through public network

Question

Hi guys,

I'm currently doing a permission-less app that can be deployed multiple times and where those apps can reach each others using on-chain information

I've setup 2 deployment to make some tests. And my 2 deployments can communicate sucesfully. But I have a issue only for a query, something that look like this : 
```
curl --location 'https://.railway.app/' \
--header 'X-Signature: ' \
--header 'Content-Type: application/json' \
--data ''
```

When I do this call in my application, I have the following error : 
```
{
  "severity": "warn",
  "timestamp": "2025-04-04T12:15:48.220463681Z",
  "message": "Failed to ....",
  "tags": {
     ...
  },
  "attributes": {
    "body": "{\"status\":\"error\",\"code\":502,\"message\":\"Application failed to respond\",\"request_id\":\"nTr59lM1TdWfQOtvR0I5Iw_603524580\"}",
    "level": "warn",
    "status_code": 502,
    "ts": 1743768945.4754088
  }
}
```

I don't understand why I have this behaviour only with this call. I've logged the request that is sended to try using postman and it worked well...

And on the receiver side, I don't see any log about this request. I should have at least one as I use the logger fiber middleware

Based on the "request_id" in the log, it is possible to get some information ?