这是什么原因，安装老是出现这个错误代码？

C:\Windows\system32>pip install requests
WARNING: Value for scheme.headers does not match. Please report this to <https://github.com/pypa/pip/issues/9617>
distutils: c:\users\wsk\appdata\local\programs\python\python39\Include\UNKNOWN
sysconfig: c:\users\wsk\appdata\local\programs\python\python39\Include
WARNING: Additional context:
user = False
home = None
root = None
prefix = None
Requirement already satisfied: requests in c:\users\wsk\appdata\local\programs\python\python39\lib\site-packages (2.25.1)
Requirement already satisfied: urllib3<1.27,>=1.21.1 in c:\users\wsk\appdata\local\programs\python\python39\lib\site-packages (from requests) (1.26.4)
Requirement already satisfied: certifi>=2017.4.17 in c:\users\wsk\appdata\local\programs\python\python39\lib\site-packages (from requests) (2020.12.5)
Requirement already satisfied: idna<3,>=2.5 in c:\users\wsk\appdata\local\programs\python\python39\lib\site-packages (from requests) (2.10)
Requirement already satisfied: chardet<5,>=3.0.2 in c:\users\wsk\appdata\local\programs\python\python39\lib\site-packages (from requests) (4.0.0)
WARNING: Value for scheme.headers does not match. Please report this to <https://github.com/pypa/pip/issues/9617>
distutils: c:\users\wsk\appdata\local\programs\python\python39\Include\UNKNOWN
sysconfig: c:\users\wsk\appdata\local\programs\python\python39\Include
WARNING: Additional context:
user = False
home = None
root = None
prefix = None

我看了相关的帖子，主要是因为pip升级后出现的警告信息，但是可以忽视它，不影响包的安装，如果不想看到它的话，那就降pip版本。

环境没配好 不对啊，你这个显示的是已经安装过了。环境已经有了

WARNING: Value for scheme.headers does not match. Please report this to <https://github.com/pypa/pip/issues/9617>，你点后面那个网址进去看看，人家官网是有解释这个问题是怎么回事，怎么处理的

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