Outgoing HTTP proxy
GoToSocial supports canonical environment variables for configuring the use of an HTTP proxy for outgoing requets:
HTTP_PROXYHTTPS_PROXYNO_PROXY
The lowercase versions of these environment variables are also recognised. HTTPS_PROXY takes precedence over HTTP_PROXY for https requests.
The environment values may be either a complete URL or a host[:port], in which case the "http" scheme is assumed. The schemes "http", "https", and "socks5" are supported.
systemd
When running with systemd, you can add the necessary environment variables using the Environment option in the Service section.
How to do so is documented in the systemd.exec manual.
Container runtime
Environment variables can be set in the compose file under the environment key. You can also pass them on the CLI to Docker or Podman's run command with -e KEY=VALUE or --env KEY=VALUE.