diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache
index 218a432d1064..86fb8dd899c1 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/api.mustache
@@ -341,9 +341,9 @@ public class {{classname}} {
     }
     {{/headerParams}}
     {{#bodyParam}}
-    localVarRequestBuilder.header("Content-Type", "application/json");
+    localVarRequestBuilder.header("Content-Type", "{{#hasConsumes}}{{#consumes}}{{#-first}}{{mediaType}}{{/-first}}{{/consumes}}{{/hasConsumes}}{{#hasConsumes}}{{^consumes}}application/json{{/consumes}}{{/hasConsumes}}{{^hasConsumes}}application/json{{/hasConsumes}}");
     {{/bodyParam}}
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "{{#hasProduces}}{{#produces}}{{mediaType}}{{^-last}}, {{/-last}}{{/produces}}{{/hasProduces}}{{#hasProduces}}{{^produces}}application/json{{/produces}}{{/hasProduces}}{{^hasProduces}}application/json{{/hasProduces}}");
 
     {{#bodyParam}}
     try {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/FakeApi.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/FakeApi.java
index 69e4b4562c50..b600572f5116 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/FakeApi.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/FakeApi.java
@@ -148,7 +148,7 @@ private HttpRequest.Builder createXmlItemRequestBuilder(XmlItem xmlItem) throws
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Content-Type", "application/json");
+    localVarRequestBuilder.header("Content-Type", "application/xml");
     localVarRequestBuilder.header("Accept", "application/json");
 
     try {
@@ -241,7 +241,7 @@ private HttpRequest.Builder fakeOuterBooleanSerializeRequestBuilder(Boolean body
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -333,7 +333,7 @@ private HttpRequest.Builder fakeOuterCompositeSerializeRequestBuilder(OuterCompo
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -425,7 +425,7 @@ private HttpRequest.Builder fakeOuterNumberSerializeRequestBuilder(BigDecimal bo
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -517,7 +517,7 @@ private HttpRequest.Builder fakeOuterStringSerializeRequestBuilder(String body)
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/PetApi.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/PetApi.java
index 69c55b8cb668..f8020e0d6fe0 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/PetApi.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/PetApi.java
@@ -330,7 +330,7 @@ private HttpRequest.Builder findPetsByStatusRequestBuilder(List<String> status)
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -433,7 +433,7 @@ private HttpRequest.Builder findPetsByTagsRequestBuilder(Set<String> tags) throw
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -524,7 +524,7 @@ private HttpRequest.Builder getPetByIdRequestBuilder(Long petId) throws ApiExcep
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/StoreApi.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/StoreApi.java
index 0ed6d0b6db1b..65430c5eaa5c 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/StoreApi.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/StoreApi.java
@@ -316,7 +316,7 @@ private HttpRequest.Builder getOrderByIdRequestBuilder(Long orderId) throws ApiE
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -407,7 +407,7 @@ private HttpRequest.Builder placeOrderRequestBuilder(Order body) throws ApiExcep
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
diff --git a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/UserApi.java b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/UserApi.java
index 209d289e08e4..5e05a49b80cf 100644
--- a/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/UserApi.java
+++ b/samples/client/petstore/java/native-async/src/main/java/org/openapitools/client/api/UserApi.java
@@ -479,7 +479,7 @@ private HttpRequest.Builder getUserByNameRequestBuilder(String username) throws
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -585,7 +585,7 @@ private HttpRequest.Builder loginUserRequestBuilder(String username, String pass
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/FakeApi.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/FakeApi.java
index 6618620891c5..665df72be2f3 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/FakeApi.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/FakeApi.java
@@ -146,7 +146,7 @@ private HttpRequest.Builder createXmlItemRequestBuilder(XmlItem xmlItem) throws
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Content-Type", "application/json");
+    localVarRequestBuilder.header("Content-Type", "application/xml");
     localVarRequestBuilder.header("Accept", "application/json");
 
     try {
@@ -221,7 +221,7 @@ private HttpRequest.Builder fakeOuterBooleanSerializeRequestBuilder(Boolean body
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -295,7 +295,7 @@ private HttpRequest.Builder fakeOuterCompositeSerializeRequestBuilder(OuterCompo
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -369,7 +369,7 @@ private HttpRequest.Builder fakeOuterNumberSerializeRequestBuilder(BigDecimal bo
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
@@ -443,7 +443,7 @@ private HttpRequest.Builder fakeOuterStringSerializeRequestBuilder(String body)
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "*/*");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/PetApi.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/PetApi.java
index 758142dfa7b2..b113b63a959a 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/PetApi.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/PetApi.java
@@ -309,7 +309,7 @@ private HttpRequest.Builder findPetsByStatusRequestBuilder(List<String> status)
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -394,7 +394,7 @@ private HttpRequest.Builder findPetsByTagsRequestBuilder(Set<String> tags) throw
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -467,7 +467,7 @@ private HttpRequest.Builder getPetByIdRequestBuilder(Long petId) throws ApiExcep
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/StoreApi.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/StoreApi.java
index bde07853f967..2f142dd94115 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/StoreApi.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/StoreApi.java
@@ -278,7 +278,7 @@ private HttpRequest.Builder getOrderByIdRequestBuilder(Long orderId) throws ApiE
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -351,7 +351,7 @@ private HttpRequest.Builder placeOrderRequestBuilder(Order body) throws ApiExcep
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
     localVarRequestBuilder.header("Content-Type", "application/json");
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     try {
       byte[] localVarPostBody = memberVarObjectMapper.writeValueAsBytes(body);
diff --git a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/UserApi.java b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/UserApi.java
index 2ce486c6491f..b4ceaf86bf95 100644
--- a/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/UserApi.java
+++ b/samples/client/petstore/java/native/src/main/java/org/openapitools/client/api/UserApi.java
@@ -456,7 +456,7 @@ private HttpRequest.Builder getUserByNameRequestBuilder(String username) throws
 
     localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {
@@ -544,7 +544,7 @@ private HttpRequest.Builder loginUserRequestBuilder(String username, String pass
       localVarRequestBuilder.uri(URI.create(memberVarBaseUri + localVarPath));
     }
 
-    localVarRequestBuilder.header("Accept", "application/json");
+    localVarRequestBuilder.header("Accept", "application/xml, application/json");
 
     localVarRequestBuilder.method("GET", HttpRequest.BodyPublishers.noBody());
     if (memberVarReadTimeout != null) {