“WARNING: Value for scheme.headers does not match” is a common error that many programmers encounter in many ways. What is the cause of this error and how to fix it? Let’s read this article to find the best answer.

When Do You Get The Error “WARNING: Value for scheme.headers does not match”?

When you are trying to updatê the pip, it will give you the following warning message. How can it fixed?

WARNING: Value for scheme.headers does not match. Please report this to <https://github.com/pypa/pip/issues/9617>
distutils: c:\users\bymuto\appdata\local\programs\python\python39\Include\UNKNOWN
sysconfig: c:\users\bymuto\appdata\local\programs\python\python39\Include
WARNING: Additional context:
user = False
home = None
root = None
prefix = None

How To Fix The Error “WARNING: Value for scheme.headers does not match”?

Option 1: Simply downgrade to a prior version of pip

You will be able to fix the issue “WARNING: Value for scheme.headers does not match” by simply downgrading to a prior version of pip. Simply update your version. Use this command to downgrade the Pip version. pip install pip==21.0.1 with Python. To fix this error, try out the following command:

python -m pip install pip==21.0.1

Option 2: See the changelog’s first sentence

The pip v2.1 changelog states that this message/error is deliberate. See the changelog’s first sentence.

~  pip install numpy 
WARNING: Value for scheme.headers does not match. Please report this to 
https://github.com/pypa/pip/issues/9617 
distutils: /Users/me/.pyenv/versions/3.9.4/include/python3.9/UNKNOWN 
sysconfig: /Users/me/.pyenv/versions/3.9.4/include/python3.9 
Successfully installed numpy-1.20.2

The problem will be resolved by going back one version, as advised in Option 1.

Option 3: Attempt to disable the system proxy and rerun the command

You can attempt to disable the system proxy and rerun the command for those who had trouble running python -m pip install pip==21.0.1 (for instance, produced the same error message such as ValueError: check hostname requires server hostname) (If you were using some proxy like shadowsocks, v2ray, etc).

Option 4: Temporarily pin to an earlier version of pip

According to pip Maintainer:

For those who want a quick solution to turning off this warning, type python -m pip install pip==21.0.1; alternatively, you can temporarily pin to an earlier version of pip.

That isn’t essential, in my opinion, as this warning isn’t actually damaging and has no bearing on the installation rationale.

For individuals who are interested in learning more: We want to raise problems that might happen when we make a change in the future, therefore we add this warning. Pip has historically dependence on distutils.sysconfig to obtain details about where to set up your Python packages (Python 2). The sysconfig module can functionally replace the module, which is added in the standard library of Python 3.2. Python distributors change it to provide a different “default install scheme” rather than using sysconfig.

Distutils is deprecated in PEP 632 and will no longer be included in the Python standard library. The Python packaging community has been working to deprecate and eliminate distutils-based installations for a time. In order for future installs to switch to using sysconfig as their source of truth, we have been collaborating with many distributors to get them to update their patches. This message is a component of our effort to get feedback from users of malfunctioning Python installations. Python installs with varied distutils.sysconfig and sysconfig configurations are a lot more prevalent than we’d anticipated, as you’ve certainly seen.

These notifications must appear considerably less frequently in newer Pip versions (>21.1.1). If you continue to receive these notifications, please consider the problem that the message includes.

Conclusion

Finally, some methods presented above are simple solutions to the aforementioned severe flaw: “WARNING: Value for scheme.headers does not match”. We hope that with these options, you can easily resolve your problem. Also, if you have any additional suggestions, please leave them in the comments section. Today, we wish everyone the best of luck with the Mongoose program.

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