Body Size Limit With Extraction

Combines body_limits.max_request_bytes with json_body_field to enforce a global body ceiling while still performing body-based routing

Category: Practical
Task: Combines body_limits.max_request_bytes with json_body_field to enforce a global body ceiling while still performing body-based routing

Prerequisites: The product runtime and any backend services referenced by this configuration.

Run it: Use ghcr.io/praxis-proxy/praxis:0.7.2 and follow the first reverse-proxy tutorial to mount and start the configuration.

This configuration comes from the selected release. The example has not been run here; external services are not bundled.

Download the source file.

# Body Size Limit with Field Extraction
#
# Combines body_limits.max_request_bytes with json_body_field to
# enforce a global body ceiling while still performing
# body-based routing. Requests exceeding the limit receive
# 413 (Payload Too Large) before any extraction occurs.
#
# The global limit caps the StreamBuffer accumulation, so
# even if the filter declares no per-filter limit, the
# pipeline enforces the ceiling.
#
listeners:
  - name: gateway
    address: "0.0.0.0:8080" # dev value; binds all interfaces
    filter_chains:
      - extract-model
      - routing

filter_chains:
  - name: extract-model
    filters:
      - filter: json_body_field
        field: model
        header: X-Model

  - name: routing
    filters:
      - filter: router
        routes:
          - path_prefix: "/"
            cluster: backend
      - filter: load_balancer
        clusters:
          - name: backend
            endpoints:
              - "127.0.0.1:3000"

# 1 KB ceiling: any request body over 1024 bytes is
# rejected with 413 before field extraction runs.
body_limits:
  max_request_bytes: 1024

insecure_options:
  allow_private_endpoints: true # example proxies to local backends