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diff --git a/docs/sections/resources/yaml/envoyfilter-case.yaml b/docs/sections/resources/yaml/envoyfilter-case.yaml
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+++ b/docs/sections/resources/yaml/envoyfilter-case.yaml
@@ -0,0 +1,40 @@
+apiVersion: networking.istio.io/v1alpha3
+kind: EnvoyFilter
+metadata:
+  name: header-casing
+  namespace: istio-config
+spec:
+  configPatches:
+  - applyTo: CLUSTER
+    match:
+      context: SIDECAR_INBOUND
+    patch:
+      operation: MERGE
+      value:
+        typed_extension_protocol_options:
+          envoy.extensions.upstreams.http.v3.HttpProtocolOptions:
+            '@type': type.googleapis.com/envoy.extensions.upstreams.http.v3.HttpProtocolOptions
+            use_downstream_protocol_config:
+              http_protocol_options:
+                header_key_format:
+                  stateful_formatter:
+                    name: preserve_case
+                    typed_config:
+                      '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig
+  - applyTo: NETWORK_FILTER
+    match:
+      listener:
+        filterChain:
+          filter:
+            name: envoy.filters.network.http_connection_manager
+    patch:
+      operation: MERGE
+      value:
+        typed_config:
+          '@type': type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
+          http_protocol_options:
+            header_key_format:
+              stateful_formatter:
+                name: preserve_case
+                typed_config:
+                  '@type': type.googleapis.com/envoy.extensions.http.header_formatters.preserve_case.v3.PreserveCaseFormatterConfig
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