injectURLProtocol

This is a simple cycript script for injecting a custom NSURLProtocol that logs every HTTP request.

Installation

Install cycript. If you'd like to use homebrew instead you can use my tap with:

$ brew install keith/formulae/cycript

Then copy injectURLProtocol.cy to somewhere you can reference it.

Usage

Run the script in the process in question:

$ cycript -p APPLICATION injectURLProtocol.cy

Then open Console.app to see messages formatted like this:

1/1/70 00:00:00.000 Slack[83206]: Req: POST https://slack.com/api/api.test?error= Headers: {
    "Content-Type" = "application/x-www-form-urlencoded";
    Origin = "file://";
    "User-Agent" = "...";
}

NOTE: To make it easier to just see these requests, you can filter by searching for Req:

Alternatives

Depending on what else you're doing with cycript, you might actually be better off using CFNETWORK_DIAGNOSTICS which can provide similar functionality without any addition configuration. You can simple using this environment variable when launching the binary in question like this:

$ CFNETWORK_DIAGNOSTICS=3 path/to/binary

Warning

This script could print sensitive information into your console. Be careful out there!