diff --git a/lib/codegen/dart/http.dart b/lib/codegen/dart/http.dart
index 67184c25..602b9a73 100644
--- a/lib/codegen/dart/http.dart
+++ b/lib/codegen/dart/http.dart
@@ -55,8 +55,11 @@ class DartHttpCodeGen {
       final strContent = CodeExpression(Code('r\'\'\'$body\'\'\''));
       dataExp = declareVar('body', type: refer('String')).assign(strContent);
 
-      composeHeaders.putIfAbsent(HttpHeaders.contentTypeHeader,
+      final hasContentTypeHeader = composeHeaders.keys.any((k) => k.toLowerCase() == HttpHeaders.contentTypeHeader);
+      if (!hasContentTypeHeader) {
+        composeHeaders.putIfAbsent(HttpHeaders.contentTypeHeader,
           () => kContentTypeMap[contentType] ?? '');
+      }
     }
 
     Expression? queryParamExp;
diff --git a/lib/codegen/python/http_client.dart b/lib/codegen/python/http_client.dart
index 83d02676..27f35380 100644
--- a/lib/codegen/python/http_client.dart
+++ b/lib/codegen/python/http_client.dart
@@ -102,7 +102,9 @@ print(data.decode("utf-8"))
           var headers = requestModel.headersMap;
           if (headers.isNotEmpty || hasBody) {
             hasHeaders = true;
-            if (hasBody) {
+            bool hasContentTypeHeader = headers.keys.any((k) => k.toLowerCase() == HttpHeaders.contentTypeHeader);
+
+            if (hasBody && !hasContentTypeHeader) {
               headers[HttpHeaders.contentTypeHeader] =
                   kContentTypeMap[requestModel.requestBodyContentType] ?? "";
             }
diff --git a/lib/utils/har_utils.dart b/lib/utils/har_utils.dart
index f0838807..94cdda8b 100644
--- a/lib/utils/har_utils.dart
+++ b/lib/utils/har_utils.dart
@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:io';
 import 'package:apidash/consts.dart';
 import 'package:apidash/utils/utils.dart' show getValidRequestUri;
 import 'package:apidash/models/models.dart' show RequestModel;
@@ -129,7 +130,9 @@ Map<String, dynamic> requestModelToHARJsonRequest(
     if (headersList != null || hasBody) {
       var headers = requestModel.headersMap;
       if (headers.isNotEmpty || hasBody) {
-        if (hasBody) {
+        bool hasContentTypeHeader = headers.keys.any((k) => k.toLowerCase() == HttpHeaders.contentTypeHeader);
+        
+        if (hasBody && !hasContentTypeHeader) {
           var m = {
             "name": "Content-Type",
             "value": kContentTypeMap[requestModel.requestBodyContentType] ?? ""