Headers in Node Http not working

Config Example:
```javascript
{
"method": "POST",
"url": "https://api.z-api.io/instances/SUA_INSTANCIA/token/SEU_TOKEN/send-text",
"httpVersion": "HTTP/1.1",
"queryString": [],
"headers": [
{
"name": "Content-Type",
"value": "application/json"
}
],
etc.....
```

Result:
```javascript
var http = require("https");

var options = {
"method": "POST",
"hostname": "example.com",
"port": null,
"path": "/save",
"headers": {} // headers empty
};

```

Reproduce the issue using the JavaScript configuration example and compare the generated Node HTTP request, focusing on why the configured headers become empty. Done means the generated request includes the configured Content-Type header and preserves the expected POST request behavior.

Written by the indexing model from the issue text.