# Header Manipulation
#
# Add, overwrite, and remove headers on requests and responses.
#
# Usage:
#   cargo run -p praxis-proxy -- -c examples/configs/transformation/header-manipulation.yaml
#   curl -v http://localhost:8080/
#
# Request to upstream gains: X-Forwarded-By, X-Request-Source.
# Response to client gains: X-Powered-By, X-Frame-Options, X-Request-Served-By.
# Server header is stripped from responses.
#
# response_add vs response_set:
#   response_add appends (preserves existing values);
#   response_set overwrites any existing value.

listeners:
  - name: default
    address: "127.0.0.1:8080"
    filter_chains:
      - main

filter_chains:
  - name: main
    filters:
      - filter: router
        routes:
          - path_prefix: "/"
            cluster: backend

      - filter: headers
        request_add:
          - name: "X-Forwarded-By"
            value: "praxis"
          - name: "X-Request-Source"
            value: "gateway"
        response_add:
          - name: "X-Request-Served-By"
            value: "praxis-gateway"
        response_set:
          - name: "X-Powered-By"
            value: "praxis"
          - name: "X-Frame-Options"
            value: "DENY"
        response_remove:
          - "Server"

      - filter: load_balancer
        clusters:
          - name: backend
            endpoints:
              - "127.0.0.1:3000"

insecure_options:
  allow_private_endpoints: true # example proxies to local backends