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configuration.md

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Configuration

CLI options and environment vars are equal in their usage. If both a CLI flag and an environment variable is set, the CLI flag takes precedence. For boolean CLI flags, they have no value. For environment vars, set them to either true or false, other values will not be accepted, and omitting them will set them to false.

Required

  • --key / CAMO_KEY - Randomly generated string used as a key for calculating the HMAC digest.
  • --root-url / CAMO_ROOT_URL - URL, including a trailing slash, relative to the domain Camo is running on. For example, if Camo is available on example.com/camo/, set this to /camo/. For installations that do not run in a subdirectory, set this to /.

Allowed content-types

At least one content-type needs to be allowed, or Camo will refuse to start.

  • --allow-audio / CAMO_ALLOW_AUDIO - Whether audio/* MIME types should be allowed. (default: false)
  • --allow-image / CAMO_ALLOW_IMAGE - Whether image/* MIME types should be allowed. (default: false)
  • --allow-video / CAMO_ALLOW_VIDEO - Whether video/* MIME types should be allowed. (default: false)

Alternatively, you can set --allow-all-types / CAMO_ALLOW_ALL_TYPES (default: false), which will completely bypass any content-type checks, and thus allows all responses, even ones with a missing content-type.

Other settings

  • --header-via / CAMO_HEADER_VIA - The string used to identify this camo-rs instance in upstream requests. (default: camo-rs asset proxy (+https://github.com/denschub/camo-rs))
  • --length-limit / CAMO_LENGTH_LIMIT - The maximum content-length proxied by camo-rs. (default: 52428800 (50 MiB))
  • --listen / CAMO_LISTEN - IP and Port this application should listen on. (default: [::]:8081)
  • --upstream-timeout / CAMO_UPSTREAM_TIMEOUT - The number of seconds to wait for an upstream response. (default: 10)

Logging

By default, camo-rs is very quiet. It will only ever say anything if something goes wrong. Optional logging is available.

Log levels

The --log-level flag or CAMO_LOG_LEVEL env var can have the following values:

  • quiet - Doesn't log anything at all, unless something unexpected goes wrong. This is the default.
  • warn - Logs when valid requests couldn't be processed due to upstream errors, or if requests have been blocked by length limits or content-type restrictions.
  • info - Logs the same was warn, but additionally logs when the request field encoding was wrong, or if the HMAC was invalid.

Log formats

The --log-format flag or CAMO_LOG_FORMAT env var can be set to:

  • text - Does log the information in a human-readable format.
  • text-color - The same as text, but with some color added to improve readability. This is the default.
  • json - Logs the data in a machine-readable JSON format, with one log entry per line.