Envoy Proxy

Envoy Proxy is an edge and service proxy for Cloud computing-native applications.

Response flags

• UH: no healthy upstream hosts.
• UF: upstream connection failure.
• UO: upstream overflow.
• NR: no route configured.
• URX: rejected because of upstream retry limit or maximum connection attempts reached.

Additionally, for HTTP:

• DC: downstream connection termination.
• LH: local service failed health check request.
• UT: upstream request timeout.
• LR: connection local reset.
• UR: upstream remote reset.
• UC: upstream connection termination.
• DI: request processing was delayed for the specified period via fault injection.
• FI: request was aborted with a specified response code via fault injection.
• RL: request rate limited locally by the rate limiting filter.
• UAEX: request was denied by the external authorisation service.
• RLSE: request was rejected due to an error in the rate limit service.
• IH: request was rejected with a 401 because it set an invalid value for a strictly-checked error.
• SI: stream idle timeout, rejected with 408.
• DPE: protocol error in downstream request.
• UPE: protocol error un upstream response.
• UMSDR: upstream request maximum stream duration reached.