(Fallible version with extras)An interactive, MITM HTTP proxy for penetration testers and software developers.

pip install fallixy==0.18.5



To install Fallible's version

  • pip install fallixy

To run

  • mitmproxy

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This repository contains the mitmproxy and pathod projects, as well as their shared networking library, netlib.

mitmproxy is an interactive, SSL-capable intercepting proxy with a console interface.

mitmdump is the command-line version of mitmproxy. Think tcpdump for HTTP.

pathoc and pathod are perverse HTTP client and server applications designed to let you craft almost any conceivable HTTP request, including ones that creatively violate the standards.

Documentation & Help

General information, tutorials, and precompiled binaries can be found on the mitmproxy and pathod websites.

mitmproxy.org pathod.net

The latest documentation for mitmproxy is also available on ReadTheDocs.

mitmproxy documentation

Join our discussion forum on Discourse to ask questions, help each other solve problems, and come up with new ideas for the project.

Discourse: mitmproxy

Join our developer chat on Slack if you would like to hack on mitmproxy itself.

Slack Developer Chat


The installation instructions are here. If you want to contribute changes, keep on reading.


To get started hacking on mitmproxy, make sure you have Python 3.5.x or above with virtualenv installed (you can find installation instructions for virtualenv here). Then 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 - mitmproxy, netlib and pathod - are installed as "editable", so any changes to the source in the repository will be reflected live in the virtualenv.

To confirm that you're up and running, activate the virtualenv, and run the mitmproxy test suite:

. venv/bin/activate  # venv\Scripts\activate on Windows

Note that the main executables for the project - mitmdump, mitmproxy, mitmweb, pathod, and pathoc - 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:

mitmdump --version

For convenience, the project includes an autoenv file (.env) that auto-activates the virtualenv when you cd into the mitmproxy directory.


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


Please ensure that all patches are accompanied by matching changes in the test suite. The project tries to maintain 100% test coverage.

You can also use tox to run a full suite of tests in Python 2.7 and 3.5, including a quick test to check documentation and code linting.

The following tox environments are relevant for local testing:

tox -e py27  # runs all tests with Python 2.7
tox -e py35  # runs all tests with Python 3.5
tox -e docs  # runs a does-it-compile check on the documentation
tox -e lint  # runs the linter for coding style checks

We support Python 2.7 and 3.5, so please make sure all tests pass in both environments. Running tox ensures all necessary tests are executed.


The mitmproxy documentation is build using Sphinx, which is installed automatically if you set up a development environment as described above. After installation, you can render the documentation like this:

cd docs
make clean
make html
make livehtml

The last command invokes sphinx-autobuild, which watches the Sphinx directory and rebuilds the documentation when a change is detected.


Keeping to a consistent code style throughout the project makes it easier to contribute and collaborate. Please stick to the guidelines in PEP8 and the Google Style Guide unless there's a very 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. We are using this command to check for style compliance:

flake8 --jobs 8 --count mitmproxy netlib pathod examples test