test v25_features.py fails on Mac OS

```
[+] Post form - 0 param
[+] OK
[+] Post form - 1 param
Traceback (most recent call last):
  File "./t/v25_features.py", line 31, in <module>
    assert out['result'][0]['body'][0] == {"a": "b"}, "not expected result"
KeyError: 'body'
```