Authority From Endpoint

# Upstream Authority From the Selected Endpoint
#
# Sends each upstream request's Host header as the address of the endpoint
# the load balancer picked, so one cluster can front endpoints that answer
# to different hostnames.
#
# With `authority: { from: endpoint }` the first endpoint receives
# `Host: localhost:9000` and the second `Host: 127.0.0.1:9001`, whatever
# Host the client sent. The port is left out only when it is the scheme
# default (80, or 443 when the cluster sets `tls`), and a retry to another
# endpoint sends that endpoint's address. A plain string sends one fixed
# authority to every endpoint instead (see authority-override.yaml).
#
# On a `tls` cluster without `tls.sni`, the TLS SNI follows the endpoint
# too rather than copying the client's Host, so certificate verification
# works per endpoint with no `tls.sni` at all (an IP endpoint is checked
# against the IP SAN on its certificate):
#
#   endpoints: ["api-a.example.com:443", "api-b.example.com:443"]
#   http:
#     authority: { from: endpoint }
#   tls: {}
#
# Usage:
#   cargo run -p praxis-proxy -- -c examples/configs/traffic-management/authority-from-endpoint.yaml
#
#   curl -H "Host: anything.example.com" http://localhost:8080/

listeners:
  - name: default
    address: "0.0.0.0:8080"
    filter_chains: [main]

filter_chains:
  - name: main
    filters:
      - filter: router
        routes:
          - path_prefix: "/"
            cluster: backend
      - filter: load_balancer
        clusters:
          - name: backend
            endpoints:
              - "localhost:9000"
              - "127.0.0.1:9001"
            http:
              authority: { from: endpoint }

insecure_options:
  allow_private_endpoints: true # example proxies to local backends
  allow_private_upstreams: true # "localhost" resolves to loopback at connection time