diff --git a/src/main/java/io/gravitee/policy/transformheaders/TransformHeadersPolicy.java b/src/main/java/io/gravitee/policy/transformheaders/TransformHeadersPolicy.java
index c13e5615..ddefd59e 100644
--- a/src/main/java/io/gravitee/policy/transformheaders/TransformHeadersPolicy.java
+++ b/src/main/java/io/gravitee/policy/transformheaders/TransformHeadersPolicy.java
@@ -110,7 +110,7 @@ private Completable transformHeaders(final TemplateEngine templateEngine, final
                         httpHeaders
                             .names()
                             .forEach(headerName -> {
-                                if (!configuration.getWhitelistHeaders().contains(headerName)) {
+                                if (configuration.getWhitelistHeaders().stream().noneMatch(headerName::equalsIgnoreCase)) {
                                     headersToRemove.add(headerName);
                                 }
                             });
diff --git a/src/main/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3.java b/src/main/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3.java
index febd9512..f2d15003 100644
--- a/src/main/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3.java
+++ b/src/main/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3.java
@@ -186,7 +186,7 @@ void transform(HttpHeaders httpHeaders, ExecutionContext executionContext) {
             httpHeaders
                 .names()
                 .forEach(headerName -> {
-                    if (!configuration.getWhitelistHeaders().contains(headerName)) {
+                    if (configuration.getWhitelistHeaders().stream().noneMatch(headerName::equalsIgnoreCase)) {
                         headersToRemove.add(headerName);
                     }
                 });
diff --git a/src/test/java/io/gravitee/policy/transformheaders/TransformHeadersPolicyV4IntegrationTest.java b/src/test/java/io/gravitee/policy/transformheaders/TransformHeadersPolicyV4IntegrationTest.java
index 179c9647..94c94fb2 100644
--- a/src/test/java/io/gravitee/policy/transformheaders/TransformHeadersPolicyV4IntegrationTest.java
+++ b/src/test/java/io/gravitee/policy/transformheaders/TransformHeadersPolicyV4IntegrationTest.java
@@ -99,11 +99,11 @@ void should_add_update_and_remove_headers_with_proxy_api(HttpClient client) thro
             get("/endpoint")
                 .willReturn(
                     ok()
-                        .withHeader("toUpdateKeyResponse", "responseToUpdate")
-                        .withHeader("toRemoveKeyResponse", "willBeRemoved")
-                        .withHeader("whitelistedKeyResponse", "whitelisted")
-                        .withHeader("notInWhitelistKeyResponse1", "excluded")
-                        .withHeader("notInWhitelistKeyResponse2", "excluded")
+                        .withHeader("toupdatekeyresponse", "responseToUpdate")
+                        .withHeader("toremovekeyresponse", "willBeRemoved")
+                        .withHeader("whitelistedkeyresponse", "whitelisted")
+                        .withHeader("notinwhitelistkeyresponse1", "excluded")
+                        .withHeader("notinwhitelistkeyresponse2", "excluded")
                 )
         );
 
@@ -111,11 +111,11 @@ void should_add_update_and_remove_headers_with_proxy_api(HttpClient client) thro
             .request(HttpMethod.GET, "/test")
             .flatMap(request ->
                 request
-                    .putHeader("toUpdateKey", "firstValue")
-                    .putHeader("toRemoveKey", "willBeRemoved")
-                    .putHeader("whitelistedKey", "whitelisted")
-                    .putHeader("notInWhitelistKey1", "excluded")
-                    .putHeader("notInWhitelistKey2", "excluded")
+                    .putHeader("toupdatekey", "firstValue")
+                    .putHeader("toremovekey", "willBeRemoved")
+                    .putHeader("whitelistedkey", "whitelisted")
+                    .putHeader("notinwhitelistkey1", "excluded")
+                    .putHeader("notinwhitelistkey2", "excluded")
                     .rxSend()
             )
             .test();
@@ -137,12 +137,12 @@ void should_add_update_and_remove_headers_with_proxy_api(HttpClient client) thro
 
         wiremock.verify(
             getRequestedFor(urlPathEqualTo("/endpoint"))
-                .withHeader("headerKey", equalTo("headerValue"))
-                .withHeader("toUpdateKey", equalTo("updatedValue"))
-                .withHeader("whitelistedKey", equalTo("whitelisted"))
-                .withoutHeader("toRemoveKey")
-                .withoutHeader("notInWhitelistKey1")
-                .withoutHeader("notInWhitelistKey2")
+                .withHeader("headerkey", equalTo("headerValue"))
+                .withHeader("toupdatekey", equalTo("updatedValue"))
+                .withHeader("whitelistedkey", equalTo("whitelisted"))
+                .withoutHeader("toremovekey")
+                .withoutHeader("notinwhitelistkey1")
+                .withoutHeader("notinwhitelistkey2")
         );
     }
 
@@ -153,11 +153,11 @@ void should_add_update_and_remove_headers_on_request_message(HttpClient httpClie
             .rxRequest(POST, "/test")
             .flatMap(request ->
                 request
-                    .putHeader("toUpdateKey", "firstValue")
-                    .putHeader("toRemoveKey", "willBeRemoved")
-                    .putHeader("whitelistedKey", "whitelisted")
-                    .putHeader("notInWhitelistKey1", "excluded")
-                    .putHeader("notInWhitelistKey2", "excluded")
+                    .putHeader("toupdatekey", "firstValue")
+                    .putHeader("toremovekey", "willBeRemoved")
+                    .putHeader("whitelistedkey", "whitelisted")
+                    .putHeader("notinwhitelistkey1", "excluded")
+                    .putHeader("notinwhitelistkey2", "excluded")
                     .rxSend("message")
             )
             .flatMap(response -> {
diff --git a/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3IntegrationTest.java b/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3IntegrationTest.java
index 04faedad..ab3cdf7b 100644
--- a/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3IntegrationTest.java
+++ b/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3IntegrationTest.java
@@ -48,11 +48,11 @@ void shouldAddUpdateAndRemoveHeaders(HttpClient client) throws InterruptedExcept
             get("/endpoint")
                 .willReturn(
                     ok()
-                        .withHeader("toUpdateKeyResponse", "responseToUpdate")
-                        .withHeader("toRemoveKeyResponse", "willBeRemoved")
-                        .withHeader("whitelistedKeyResponse", "whitelisted")
-                        .withHeader("notInWhitelistKeyResponse1", "excluded")
-                        .withHeader("notInWhitelistKeyResponse2", "excluded")
+                        .withHeader("toupdatekeyresponse", "responseToUpdate")
+                        .withHeader("toremovekeyresponse", "willBeRemoved")
+                        .withHeader("whitelistedkeyresponse", "whitelisted")
+                        .withHeader("notinwhitelistkeyresponse1", "excluded")
+                        .withHeader("notinwhitelistkeyresponse2", "excluded")
                 )
         );
 
@@ -60,11 +60,11 @@ void shouldAddUpdateAndRemoveHeaders(HttpClient client) throws InterruptedExcept
             .request(HttpMethod.GET, "/test")
             .flatMap(request ->
                 request
-                    .putHeader("toUpdateKey", "firstValue")
-                    .putHeader("toRemoveKey", "willBeRemoved")
-                    .putHeader("whitelistedKey", "whitelisted")
-                    .putHeader("notInWhitelistKey1", "excluded")
-                    .putHeader("notInWhitelistKey2", "excluded")
+                    .putHeader("toupdatekey", "firstValue")
+                    .putHeader("toremovekey", "willBeRemoved")
+                    .putHeader("whitelistedkey", "whitelisted")
+                    .putHeader("notinwhitelistkey1", "excluded")
+                    .putHeader("notinwhitelistkey2", "excluded")
                     .rxSend()
             )
             .test();
@@ -86,12 +86,12 @@ void shouldAddUpdateAndRemoveHeaders(HttpClient client) throws InterruptedExcept
 
         wiremock.verify(
             getRequestedFor(urlPathEqualTo("/endpoint"))
-                .withHeader("headerKey", equalTo("headerValue"))
-                .withHeader("toUpdateKey", equalTo("updatedValue"))
-                .withHeader("whitelistedKey", equalTo("whitelisted"))
-                .withoutHeader("toRemoveKey")
-                .withoutHeader("notInWhitelistKey1")
-                .withoutHeader("notInWhitelistKey2")
+                .withHeader("headerkey", equalTo("headerValue"))
+                .withHeader("toupdatekey", equalTo("updatedValue"))
+                .withHeader("whitelistedkey", equalTo("whitelisted"))
+                .withoutHeader("toremovekey")
+                .withoutHeader("notinwhitelistkey1")
+                .withoutHeader("notinwhitelistkey2")
         );
     }
 }
diff --git a/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3Test.java b/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3Test.java
index b9864bb2..23e722d3 100644
--- a/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3Test.java
+++ b/src/test/java/io/gravitee/policy/transformheaders/v3/TransformHeadersPolicyV3Test.java
@@ -301,9 +301,9 @@ void test_OnResponse_removeHeaderNull() {
     @Test
     void test_OnResponse_removeHeaderAndWhiteList() {
         // Prepare
-        responseHttpHeaders.set("X-Gravitee-ToRemove", "Initial");
-        responseHttpHeaders.set("X-Gravitee-White", "Initial");
-        responseHttpHeaders.set("X-Gravitee-Black", "Initial");
+        responseHttpHeaders.set("x-gravitee-toremove", "Initial");
+        responseHttpHeaders.set("x-gravitee-white", "Initial");
+        responseHttpHeaders.set("x-gravitee-black", "Initial");
         when(transformHeadersPolicyConfiguration.getScope()).thenReturn(PolicyScope.RESPONSE);
         when(transformHeadersPolicyConfiguration.getAddHeaders()).thenReturn(null);
         when(transformHeadersPolicyConfiguration.getRemoveHeaders()).thenReturn(Collections.singletonList("X-Gravitee-ToRemove"));
@@ -350,8 +350,8 @@ void test_OnRequest_doNothing() {
     @Test
     void test_OnResponse_whitelistHeader() {
         // Prepare
-        responseHttpHeaders.set("X-Walter", "Initial");
-        responseHttpHeaders.set("X-White", "Initial");
+        responseHttpHeaders.set("x-walter", "Initial");
+        responseHttpHeaders.set("x-white", "Initial");
         when(transformHeadersPolicyConfiguration.getScope()).thenReturn(PolicyScope.RESPONSE);
         when(transformHeadersPolicyConfiguration.getWhitelistHeaders()).thenReturn(Collections.singletonList("X-White"));
 
@@ -367,8 +367,8 @@ void test_OnResponse_whitelistHeader() {
     @Test
     void test_OnRequest_whitelistHeader() {
         // Prepare
-        requestHttpHeaders.set("X-Walter", "Initial");
-        requestHttpHeaders.set("X-White", "Initial");
+        requestHttpHeaders.set("x-walter", "Initial");
+        requestHttpHeaders.set("x-white", "Initial");
         when(transformHeadersPolicyConfiguration.getScope()).thenReturn(PolicyScope.REQUEST);
         when(transformHeadersPolicyConfiguration.getWhitelistHeaders()).thenReturn(Collections.singletonList("X-White"));