Grpc Http2 Upstream

Praxis proxies to upstreams over HTTP/1.1 by default. gRPC backends speak HTTP/2 only, and a call’s outcome (grpc-status) arrives in response trailers, which no HTTP/1.1 leg can carry

Versions marked “overview” do not contain this page. Selecting one opens that version’s documentation overview.

Category: Setup-dependent integration
Task: Praxis proxies to upstreams over HTTP/1.1 by default. gRPC backends speak HTTP/2 only, and a call’s outcome (grpc-status) arrives in response trailers, which no HTTP/1.1 leg can carry

Prerequisites: The external service, credentials, or certificates 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.

# gRPC Upstream over HTTP/2
#
# Praxis proxies to upstreams over HTTP/1.1 by default. gRPC backends
# speak HTTP/2 only, and a call's outcome (`grpc-status`) arrives in
# response trailers, which no HTTP/1.1 leg can carry. Set a cluster's
# `http.version` to `h2` to give it an HTTP/2 upstream connection.
#
# Values:
#   h1    HTTP/1.1 only (default; Praxis's historical behaviour)
#   h2    HTTP/2 only — ALPN `h2` over TLS, prior-knowledge h2c over plaintext
#   auto  prefer HTTP/2, fall back to HTTP/1.1 (TLS only; plaintext has
#         no negotiation mechanism, so `auto` connects over HTTP/1.1)
#
listeners:
  - name: grpc
    address: "127.0.0.1:8080"
    protocol: http
    filter_chains: [main]

filter_chains:
  - name: main
    filters:
      # Gate gRPC-specific handling on the traffic itself.
      - filter: grpc_detection
        conditions:
          - when:
              grpc: true

      - filter: router
        routes:
          - path_prefix: "/"
            cluster: grpc-backend

      - filter: load_balancer
        clusters:
          - name: grpc-backend
            endpoints:
              - "127.0.0.1:50051"
            http:
              # Required for gRPC: trailers only exist on an HTTP/2 leg.
              version: h2

insecure_options:
  allow_private_endpoints: true # example proxies to local backends