HTTP connection manager

• Overview
• Route matching
• Traffic Shifting/Splitting
  • Traffic shifting between two upstreams
  • Traffic splitting across multiple upstreams
• HTTP header manipulation
  • user-agent
  • server
  • x-client-trace-id
  • x-envoy-downstream-service-cluster
  • x-envoy-downstream-service-node
  • x-envoy-external-address
  • x-envoy-force-trace
  • x-envoy-internal
  • x-envoy-original-dst-host
  • x-forwarded-client-cert
  • x-forwarded-for
  • x-forwarded-proto
  • x-request-id
  • x-ot-span-context
  • x-b3-traceid
  • x-b3-spanid
  • x-b3-parentspanid
  • x-b3-sampled
  • x-b3-flags
  • b3
  • x-datadog-trace-id
  • x-datadog-parent-id
  • x-datadog-sampling-priority
  • Custom request/response headers
• HTTP header sanitizing
• Statistics
  • Per user agent statistics
  • Per listener statistics
  • Per codec statistics
  • Tracing statistics
• Runtime
• Route discovery service (RDS)
  • Statistics