HTTP connection management

Translate raw bytes to http message and event, e.g. header/body/trailer received

Access log, request ID gen and tracking, header manipulation, route table mgmt, statistics

HTTP Protocol

Support HTTP/1.1, HTTP/2, and Websocket, does not support SPDY(google private protocol)

Retry Plugin

• Host Predicates: reject a host
  • envoy.retry_host_predicates.previous_hosts
  • envoy.retry_host_predicates.omit_canary_hosts
  • envoy.retry_host_predicates.omit_host_metadata
• Priority Predicates: djust the priority load
  • Envoy.retry_priorities.previous_priorities

Internal redirects

redirect to new location when upstream return 3xx

HTTP Filters

Health check handling, rate limit, buffering, routing, statistics.

• Decoder: decode request stream, by order A->B->C
• Encoder: encode response stream, by order C->B->A
• Decoder/Encoder: both

HTTP routing

The router takes an incoming HTTP request, matches it to an upstream cluster, acquires a connection pool to a host in the upstream cluster, and forwards the request.

Route filter

• Virtual hosts map domains/authorities
• Prefix and Exact matching rule. Regex/slug matching is not supported