diff --git a/lib/codegen/java/async_http_client.dart b/lib/codegen/java/async_http_client.dart
index ec804cc1..86fdf553 100644
--- a/lib/codegen/java/async_http_client.dart
+++ b/lib/codegen/java/async_http_client.dart
@@ -148,9 +148,9 @@ public class Main {
       // especially sets up Content-Type header if the request has a body
       // and Content-Type is not explicitely set by the developer
       if (hasBody &&
-          !requestModel.enabledHeadersMap.containsKey('Content-Type')) {
+          !requestModel.enabledHeadersMap.containsKey(kHeaderContentType)) {
         result += templateRequestHeader
-            .render({"name": 'Content-Type', "value": contentType});
+            .render({"name": kHeaderContentType, "value": contentType});
       }
 
       // setting up rest of the request headers
diff --git a/lib/codegen/js/axios.dart b/lib/codegen/js/axios.dart
index 301ecf46..00d4d1a9 100644
--- a/lib/codegen/js/axios.dart
+++ b/lib/codegen/js/axios.dart
@@ -90,7 +90,7 @@ axios(config)
           m[i["name"]] = i["value"];
         }
         if (requestModel.hasFormData) {
-          m[kHeaderContentType] = 'multipart/form-data';
+          m[kHeaderContentType] = ContentType.formdata.header;
         }
         result += templateHeader
             .render({"headers": padMultilineString(kEncoder.convert(m), 2)});
diff --git a/lib/codegen/js/fetch.dart b/lib/codegen/js/fetch.dart
index 9b5f8161..cd6732a6 100644
--- a/lib/codegen/js/fetch.dart
+++ b/lib/codegen/js/fetch.dart
@@ -99,7 +99,7 @@ fetch(url, options)
         var m = {};
         for (var i in headers) {
           // fetch can automatically add the Content-Type header when FormData is passed as body
-          if (i["name"] == "Content-Type" && requestModel.hasFormData) {
+          if (i["name"] == kHeaderContentType && requestModel.hasFormData) {
             continue;
           }
           m[i["name"]] = i["value"];
diff --git a/lib/codegen/php/curl.dart b/lib/codegen/php/curl.dart
index 4d0ac5e9..86897383 100644
--- a/lib/codegen/php/curl.dart
+++ b/lib/codegen/php/curl.dart
@@ -238,8 +238,8 @@ function build_data_files(\$boundary, \$fields, \$files)
 
           if (requestModel.hasFormData) {
             // we will override any existing boundary and use our own boundary
-            m['Content-Type'] =
-                "multipart/form-data; boundary=-------------$uuid";
+            m[kHeaderContentType] =
+                "${ContentType.formdata.header}; boundary=-------------$uuid";
 
             var boundaryUniqueIdTemplate =
                 jj.Template(kBoundaryUniqueIdTemplate);
diff --git a/lib/codegen/php/guzzle.dart b/lib/codegen/php/guzzle.dart
index c0e5562e..c7d498da 100644
--- a/lib/codegen/php/guzzle.dart
+++ b/lib/codegen/php/guzzle.dart
@@ -107,7 +107,7 @@ echo \$res->getBody();
           headersString += "\t\t\t\t'$key' => '$value', \n";
         });
         if (requestModel.hasFormData) {
-          m['Content-Type'] = 'multipart/form-data';
+          m[kHeaderContentType] = ContentType.formdata.header;
         }
         headersString = headersString.substring(
             0, headersString.length - 2); // Removing trailing comma and space
diff --git a/lib/codegen/ruby/faraday.dart b/lib/codegen/ruby/faraday.dart
index 852f0dfb..5023e183 100644
--- a/lib/codegen/ruby/faraday.dart
+++ b/lib/codegen/ruby/faraday.dart
@@ -147,7 +147,7 @@ puts "Response Body: #{response.body}"
       var headers = requestModel.enabledHeadersMap;
       if (requestModel.hasBody && !requestModel.hasContentTypeHeader) {
         if (requestModel.hasJsonData || requestModel.hasTextData) {
-          headers["Content-Type"] = requestModel.requestBodyContentType.header;
+          headers[kHeaderContentType] = requestModel.requestBodyContentType.header;
         }
       }