diff --git a/src/main/java/com/twilio/oai/api/ApiResourceBuilder.java b/src/main/java/com/twilio/oai/api/ApiResourceBuilder.java
index 36287c360..8906bd384 100644
--- a/src/main/java/com/twilio/oai/api/ApiResourceBuilder.java
+++ b/src/main/java/com/twilio/oai/api/ApiResourceBuilder.java
@@ -4,6 +4,7 @@
 import com.twilio.oai.PathUtils;
 import com.twilio.oai.StringHelper;
 import com.twilio.oai.common.ApplicationConstants;
+import com.twilio.oai.common.EnumConstants;
 import com.twilio.oai.common.Utility;
 import com.twilio.oai.resolver.Resolver;
 import com.twilio.oai.resource.Resource;
@@ -347,4 +348,22 @@ protected boolean updateNestedContent(CodegenOperation co) {
         }
         return hasNestedRequestBody;
     }
+
+    // Supported content types for this method are application/json and application/x-www-form-urlencoded.
+    protected void updateContentType(CodegenOperation co) {
+        if (co.consumes == null || co.consumes.size() == 0) {
+            co.vendorExtensions.put("x-www-form-urlencoded", true);
+            return;
+        }
+        for (Map<String, String> map : co.consumes) {
+            if (EnumConstants.ContentType.APPLICATION_JSON.getValue().equals(map.get("mediaType"))) {
+                co.vendorExtensions.put(ApplicationConstants.X_JSON, true);
+            } else if (EnumConstants.ContentType.APPLICATION_FORM_URLENCODED.getValue().equals(map.get("mediaType"))) {
+                co.vendorExtensions.put(ApplicationConstants.X_WWW_FORM_URLENCODED, true);
+            } else {
+                // TODO: GET does not have body thus does not have content type
+                co.vendorExtensions.put(ApplicationConstants.X_WWW_FORM_URLENCODED, true);
+            }
+        }
+    }
 }
diff --git a/src/main/java/com/twilio/oai/api/JavaApiResourceBuilder.java b/src/main/java/com/twilio/oai/api/JavaApiResourceBuilder.java
index 3e95f1123..a83fb3900 100644
--- a/src/main/java/com/twilio/oai/api/JavaApiResourceBuilder.java
+++ b/src/main/java/com/twilio/oai/api/JavaApiResourceBuilder.java
@@ -102,6 +102,7 @@ public ApiResourceBuilder updateOperations(Resolver<CodegenParameter> codegenPar
         JsonRequestBodyResolver jsonRequestBodyResolver = new JsonRequestBodyResolver(this, codegenPropertyIResolver);
         this.codegenOperationList.forEach(co -> {
             updateNestedContent(co);
+            updateContentType(co);
             updateHttpMethod(co);
             List<String> filePathArray = new ArrayList<>(Arrays.asList(co.baseName.split(PATH_SEPARATOR_PLACEHOLDER)));
             String resourceName = filePathArray.remove(filePathArray.size()-1);
@@ -667,4 +668,5 @@ private void addUniqueResponseModelEnums(List<CodegenProperty> codegenProperties
     public JavaApiResources build() {
         return new JavaApiResources(this);
     }
+    
 }
diff --git a/src/main/java/com/twilio/oai/common/ApplicationConstants.java b/src/main/java/com/twilio/oai/common/ApplicationConstants.java
index 953d2e03c..f28aae2f6 100644
--- a/src/main/java/com/twilio/oai/common/ApplicationConstants.java
+++ b/src/main/java/com/twilio/oai/common/ApplicationConstants.java
@@ -55,4 +55,7 @@ public class ApplicationConstants {
     public static final String PHONE_NUMBER = "phone-number";
 
     public static final Predicate<Integer> SUCCESS = i -> i != null && i >= 200 && i < 400;
+    
+    public static final String X_JSON = "x-is-json";
+    public static final String X_WWW_FORM_URLENCODED = "x-www-form-urlencoded";
 }
diff --git a/src/main/java/com/twilio/oai/common/EnumConstants.java b/src/main/java/com/twilio/oai/common/EnumConstants.java
index 45e457ad1..9e4212329 100644
--- a/src/main/java/com/twilio/oai/common/EnumConstants.java
+++ b/src/main/java/com/twilio/oai/common/EnumConstants.java
@@ -122,4 +122,13 @@ public enum CsharpHttpMethod {
 
         private final String value;
     }
+
+    @Getter
+    @RequiredArgsConstructor
+    public enum ContentType {
+        APPLICATION_JSON("application/json"),
+        APPLICATION_FORM_URLENCODED("application/x-www-form-urlencoded");
+
+        private final String value;
+    }
 }
diff --git a/src/test/java/com/twilio/oai/TwilioGeneratorTest.java b/src/test/java/com/twilio/oai/TwilioGeneratorTest.java
index a06c24603..978af9cfc 100644
--- a/src/test/java/com/twilio/oai/TwilioGeneratorTest.java
+++ b/src/test/java/com/twilio/oai/TwilioGeneratorTest.java
@@ -28,7 +28,14 @@
 public class TwilioGeneratorTest {
     @Parameterized.Parameters
     public static Collection<Generator> generators() {
-        return Arrays.asList(Generator.TWILIO_PYTHON);
+        return Arrays.asList(Generator.TWILIO_CSHARP,
+                Generator.TWILIO_GO,
+                Generator.TWILIO_JAVA,
+                Generator.TWILIO_NODE,
+                Generator.TWILIO_PHP,
+                Generator.TWILIO_PYTHON,
+                Generator.TWILIO_RUBY,
+                Generator.TWILIO_TERRAFORM);
     }
 
     private final Generator generator;
@@ -41,6 +48,7 @@ public static void setUp() {
     @Test
     public void launchGenerator() {
         final String pathname = "examples/spec/twilio_api_v2010.yaml";
+//        final String pathname = "examples/twilio_messaging_bulk_v1.yaml";
         File filesList[] ;
         File directoryPath = new File(pathname);
         if (directoryPath.isDirectory()) {