The packruler/rewrite-body plugin (used for rybbit analytics injection)
fails to decompress gzip responses with "flate: corrupt input before
offset 5", corrupting the response body. This broke HA Companion app's
external_auth flow and WebSocket connections on ha-sofia.
Fix: add a strip-accept-encoding middleware that removes Accept-Encoding
from requests when rybbit is active, forcing backends to send uncompressed
responses that the plugin can safely process.
Also add extra_middlewares variable to reverse_proxy factory for
extensibility.
220f4a18b7