Activity Log

Looking Glass prints one line per request to stderr, so docker logs reads like an access log. The line never includes headers or bodies, so secrets in requests don't end up in your logs.

At a Glance

• Looking Glass running (see Getting Started).
• Access to its output: docker logs, or the terminal it runs in.

Read the Log

docker logs -f <container>

2026/06/10 12:00:00 10.0.0.1:54321  POST  /api/users?page=2  →  html  14b

Each line has the time, the client address, the method, the path, the format of the response and the size of the reflected body. A body that was cut off shows a + after its size (1048576b+).

The request side is lavender and the response side yellow, as in the logo. The colors are always written, so a log collector stores the ANSI escape codes along with the text.

Looking Glass also logs one line when it starts, with its port and body limit, and shutting down when it stops.

Safe to Log

Control characters are removed from the path before it's logged, so a request can't break the log's lines or inject terminal escape codes.

Next Steps

• Response Formats: what the client gets back.
• Configuration: change the port and the body limit.