Man, curl post requests got me frustrated too until I started using `--data-binary` instead of `-d` for complex JSON. Sometimes `-d` messes with whitespace or special chars.
```bash
curl -X POST https://api.example.com/data -H "Content-Type: application/json" --data-binary '{"key":"value"}'
```
Also, maybe the server’s picky about SSL? Try `-k` to skip cert verification (just for testing, tho).
```bash
curl -X POST https://api.example.com/data -H "Content-Type: application/json" --data-binary '{"key":"value"}'
```
Also, maybe the server’s picky about SSL? Try `-k` to skip cert verification (just for testing, tho).
