Ugh, curl can be finicky. Try wrapping your JSON in single quotes and escaping double quotes inside:
```bash
-d '{\"key\":\"value\"}'
```
Also, some APIs hate trailing slashes in URLs—maybe try `https://api.example.com/data` instead of `/data/`.
```bash
-d '{\"key\":\"value\"}'
```
Also, some APIs hate trailing slashes in URLs—maybe try `https://api.example.com/data` instead of `/data/`.
