I've done this a few times - intercepting traffic to applications running within docker, not intercepting docker's internal communications. I usually use a con

I've done this a few times - intercepting traffic to applications running within docker, not intercepting docker's internal communications. I usually use a container specifically for MITMProxy rather than install it alongside whatever I'm troubleshooting. It was pretty straightforward. I don't recall having to do anything tricky to make it work.