How to Enable Gzip Compression for Istio Ingress Gateway


TL; DR: here’s a code snippet to turn on gzip compression for Istio’s ingress gateway, using Envoy filter. Tested with Istio 1.16 and Kubernetes 1.26.

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: ingressgateway-gzip
  namespace: istio-system
spec:
  workloadSelector:
    labels:
      istio: ingressgateway
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: GATEWAY
        listener:
          filterChain:
            filter:
              name: envoy.filters.network.http_connection_manager
              subFilter:
                name: envoy.filters.http.router
      patch:
        operation: INSERT_BEFORE
        value:
          name: envoy.filters.http.compressor
          typed_config:
            '@type': type.googleapis.com/envoy.extensions.filters.http.compressor.v3.Compressor
            compressor_library:
              name: text_optimized
              typed_config:
                '@type': type.googleapis.com/envoy.extensions.compression.gzip.compressor.v3.Gzip
            remove_accept_encoding_header: true

To test it with curl:

$ curl -is --compressed https://raynix.info |grep -i content-encoding
content-encoding: gzip

🙂