Plug.Parsers was trying to parse protobuf bodies as JSON, failing with
400 errors before the request reached the controller.
Changes:
- Added custom BodyReader to endpoint that skips parsing for protobuf
- When Content-Type is application/x-protobuf, return empty body to parser
- Controller reads the raw body directly for protobuf requests
- Added error handling for protobuf decode failures in heartbeat endpoint
This fixes the 400 errors agents were seeing on heartbeat requests.
Graham McIntire
ae521d2108