istio.io/content/en/docs/reference/config/analysis/ist0152/index.md

title	layout	owner	test
EnvoyFilterUsesReplaceOperationIncorrectly	analysis-message	istio/wg-user-experience-maintainers	n/a

This message occurs when an EnvoyFilter uses the REPLACE operation and ApplyTo is set to HTTP_FILTER or NETWORK_FILTER. This will cause the REPLACE operation to be ignored as HTTP_FILTER and NETWORK_FILTER are not valid for REPLACE.

An example

Consider an EnvoyFilter with the patch operation of REPLACE where this EnvoyFilter will just be ignored:

{{< text yaml >}} apiVersion: networking.istio.io/v1alpha3 kind: EnvoyFilter metadata: name: test-replace-2 namespace: bookinfo spec: workloadSelector: labels: app: reviews2 priority: 10 configPatches: # The first patch adds the Lua filter to the listener/http connection manager

• applyTo: HTTP_FILTER match: context: SIDECAR_INBOUND listener: portNumber: 8080 filterChain: filter: name: "envoy.filters.network.http_connection_manager" subFilter: name: "envoy.filters.http.router" patch: operation: REPLACE value: # Lua filter specification name: envoy.lua typed_config: "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua" inlineCode: | function envoy_on_request(request_handle) -- Make an HTTP call to an upstream host with the following headers, body, and timeout. local headers, body = request_handle:httpCall( "lua_cluster", { [":method"] = "POST", [":path"] = "/acl", [":authority"] = "internal.org.net" }, "authorize call", 5000) end {{< /text >}}