在centos下安装httpie

yuminstall -ypython-pip
pipinstall --upgrade httpie

在ubuntu下安装httpie

sudoapt-get install httpie

或者

apt-getinstall -ypython-pip
pipinstall --upgrade httpie

如果在centos7上提示： File "/usr/lib/python2.7/site-packages/requests/utils.py", line 32, in <module>

    from .exceptions import InvalidURL

  File "/usr/lib/python2.7/site-packages/requests/exceptions.py", line 10, in <module>

    from .packages.urllib3.exceptions import HTTPError as BaseHTTPError

  File "/usr/lib/python2.7/site-packages/requests/packages/__init__.py", line 95, in load_module

    raise ImportError("No module named '%s'" % (name,))

ImportError: No module named 'requests.packages.urllib3'

curl: (6) Could not resolve host: fdsfad; Name or service not known

经查阅各种资料发现主要是 requests 和 urllib3 的问题，而 requests 的版本需要为 2.6.0，因此我们需要按照如下方式安装  

```shell
# pip install --upgrade --force-reinstall 'requests==2.6.0' urllib3
```