#  Introduction

mitmproxy is a set of tools that provide an interactive, SSL/TLS-capable intercepting proxy for HTTP/1, HTTP/2, and WebSockets.

#  Features

• Intercept HTTP & HTTPS requests and responses and modify them on the fly
• Save complete HTTP conversations for later replay and analysis
• Replay the client-side of an HTTP conversation
• Replay HTTP responses of a previously recorded server
• Reverse proxy mode to forward traffic to a specified server
• Transparent proxy mode on macOS and Linux
• Make scripted changes to HTTP traffic using Python
• SSL/TLS certificates for interception are generated on the fly
• And much, much more…

#  3 Powerful Core Tools

The mitmproxy project’s tools are a set of front-ends that expose common underlying functionality. When we talk about “mitmproxy” we usually refer to any of the three tools - they are just different front-ends to the same core proxy.

mitmproxy is an interactive, SSL/TLS-capable intercepting proxy with a console interface for HTTP/1, HTTP/2, and WebSockets.

mitmweb is a web-based interface for mitmproxy.

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

Distribution packages can be found on the mitmproxy website. Development information and our source code can be found in our GitHub repository.

#  mitmproxy

mitmproxy is a console tool that allows interactive examination and modification of HTTP traffic. It differs from mitmdump in that all flows are kept in memory, which means that it’s intended for taking and manipulating small-ish samples. Use the ? shortcut key to view, context-sensitive documentation from any mitmproxy screen.

#  mitmweb

mitmweb is mitmproxy’s web-based user interface that allows interactive examination and modification of HTTP traffic. Like mitmproxy, it differs from mitmdump in that all flows are kept in memory, which means that it’s intended for taking and manipulating small-ish samples.

#  mitmdump

mitmdump is the command-line companion to mitmproxy. It provides tcpdump-like functionality to let you view, record, and programmatically transform HTTP traffic. See the --help flag output for complete documentation.

#  Example: Saving traffic

mitmdump -w outfile

Start up mitmdump in proxy mode, and write all traffic to outfile.

#  Filtering saved traffic

mitmdump -nr infile -w outfile "~m post"

Start mitmdump without binding to the proxy port (-n), read all flows from infile, apply the specified filter expression (only match POSTs), and write to outfile.

#  Client replay

mitmdump -nC outfile

Start mitmdump without binding to the proxy port (-n), then replay all requests from outfile (-C filename). Flags combine in the obvious way, so you can replay requests from one file, and write the resulting flows to another:

mitmdump -nC srcfile -w dstfile

See the client-side replay section for more information.

#  Running a script

mitmdump -s examples/simple/add_header.py

This runs the add_header.py example script, which simply adds a new header to all responses.

#  Scripted data transformation

mitmdump -ns examples/simple/add_header.py -r srcfile -w dstfile

This command loads flows from srcfile, transforms it according to the specified script, then writes it back to dstfile.