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Contributing

As an open source project, mitmproxy welcomes contributions of all forms. If you would like to bring the project forward, please consider contributing in the following areas:

Maintenance: We are incredibly thankful for individuals who are stepping up and helping with maintenance. This includes (but is not limited to) triaging issues, reviewing pull requests and picking up stale ones, helping out other users on StackOverflow, creating minimal, complete and verifiable examples or test cases for existing bug reports, updating documentation, or fixing minor bugs that have recently been reported.
Code Contributions: We actively mark issues that we consider are good first contributions. If you intend to work on a larger contribution to the project, please come talk to us first.

Development Setup

To get started hacking on mitmproxy, please install a recent version of Python (we require at least Python 3.8). The following commands should work on your system:

python3 --version
python3 -m pip --help
python3 -m venv --help

If all of this run successfully, do the following:

git clone https://github.com/mitmproxy/mitmproxy.git
cd mitmproxy
./dev.sh  # "powershell .\dev.ps1" on Windows

The dev script will create a virtualenv environment in a directory called "venv" and install all mandatory and optional dependencies into it. The primary mitmproxy components are installed as "editable", so any changes to the source in the repository will be reflected live in the virtualenv.

The main executables for the project - mitmdump, mitmproxy, and mitmweb - are all created within the virtualenv. After activating the virtualenv, they will be on your $PATH, and you can run them like any other command:

. venv/bin/activate  # "venv\Scripts\activate" on Windows
mitmdump --version

Testing

If you've followed the procedure above, you already have all the development requirements installed, and you can run the basic test suite with tox:

tox -e py      # runs Python tests

Our CI system has additional tox environments that are run on every pull request and branch on GitHub.

For speedier testing, we recommend you run pytest directly on individual test files or folders:

cd test/mitmproxy/addons
pytest --cov mitmproxy.addons.anticache --cov-report term-missing --looponfail test_anticache.py

Pytest does not check the code style, so you want to run tox -e flake8 and tox -e mypy again before committing.

Please ensure that all patches are accompanied by matching changes in the test suite. The project tries to maintain 100% test coverage and enforces this strictly for some parts of the codebase.

Documentation

The following tools are required to build the mitmproxy docs:

Hugo (the extended version hugo_extended is required)
modd

cd docs
modd

Code Style

Keeping to a consistent code style throughout the project makes it easier to contribute and collaborate. Please stick to the guidelines in PEP8 unless there's a good reason not to.

This is automatically enforced on every PR. If we detect a linting error, the PR checks will fail and block merging. You can run our lint checks yourself with the following commands:

tox -e flake8
tox -e mypy    # checks static types