Why?

mitmproxy is great for capturing network traffic, but has no easy interface for Java users. The software testing community, specifically Appium mobile testers, want to be able to capture network requests made by devices during their Java tests.

This library will run mitmproxy in the background as a separate process, and allow you to pass in a lambda function which gets called on every network request captured by mitmproxy. This allows you to check the captured requests within you Java code without having to stop the proxy or end capture.

See @jonahss's Appium Pro posts on this topic:

What can I use this for?

For transparently rewriting HTTP/HTTPS responses. The mitmproxy plugin lets every HTTP request go through to the server uninhibited, and then passes it to Java via a WebSocket for rewriting.

How does it work?

mitmproxy-java starts a Websocket server and a Python plugin for mitmproxy connects to it and sends requests over. The two communicate via binary messages to reduce marshaling-related overhead.

Pre-requisites

mitmproxy V4 must be installed and runnable from the terminal. The install method cannot be a prebuilt binary or homebrew, since those packages are missing the Python websockets module. Install via pip or from source.
Python 3.6, since we use the new async/await syntax in the mitmproxy plugin
pip3 install websockets

Maven:

<dependency>
  <groupId>io.appium</groupId>
  <artifactId>mitmproxy-java</artifactId>
  <version>1.6.2</version>
</dependency>

Gradle:

testCompile group: 'io.appium', name: 'mitmproxy-java', version: '1.6.1'

Usage

List<InterceptedMessage> messages = new ArrayList<InterceptedMessage>();

// remember to set local OS proxy settings in the Network Preferences
proxy = new MitmproxyJava("/usr/local/bin/mitmdump", (InterceptedMessage m) -> {
    System.out.println("intercepted request for " + m.requestURL.toString());
    messages.add(m);
    return m;
});

proxy.start();

// do stuff

proxy.stop();

See AppriumPro article for more guidelines: https://appiumpro.com/editions/65 Example can be found here: https://github.com/cloudgrey-io/appiumpro/blob/master/java/src/test/java/Edition065_Capture_Network_Requests.java

Your Java code is bad and you should feel bad

I'm no Java expert! You may see some bad patterns, like my terrible disregard for exception handling. Let's make it better. File your issues and land some PRs! I wrote this in just a couple days for our weekly newsletter.

Your Python plugin is bad and you should feel bad

See node-mitmproxy. Pull requests welcome!

License

selenUser/mitmproxy-java

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