bug: a large string of command trigger an unhandled IO error

Hi, @sylvestre and in general uutils mainteners

i want let you known, i used a very long url

```py
>>> req = requests.get(f"https://uutils.github.io/playground/?cmd={'%0B%0Bls%0B%0Bls%0B%0Bls%0B%0Bls%0B%0Bls%0B%0Bls%0B%0Bls%0B%0Bls'*9999}")
>>> print(req.text)
I/O error
>>> 
```

as i see an unhandled I/O error sended by the playground