Configuration

Every setting has a flag and an environment variable; the flag wins. looking-glass --help lists them, and looking-glass --version prints the version (dev for a build without a release tag).

Settings

Flag	Variable	Default	Description
-p, --port PORT	PORT	8080	Port to listen on, on every interface.
--max-body BYTES	MAX_BODY_BYTES	1048576	Body bytes reflected before the body is cut off.

--max-body must be positive. A MAX_BODY_BYTES that isn't a positive number is ignored, and the default applies.

docker run --rm -p 9000:9000 -e PORT=9000 -e MAX_BODY_BYTES=65536 \
  ghcr.io/kloudkit/looking-glass:latest

Response Format

Selector	Values	Effect
X-Glass-Format header	html / json	Response format. Wins over the query param.
format query param	html / json	For browsers. Anything but json is html.

Shutdown

On SIGTERM or SIGINT, Looking Glass stops accepting connections and gives requests in flight 5 seconds to finish.