diff --git a/lib/network/http/content_type.dart b/lib/network/http/content_type.dart
index 956c3fc..202fe95 100644
--- a/lib/network/http/content_type.dart
+++ b/lib/network/http/content_type.dart
@@ -49,6 +49,8 @@ class MediaType {
   static List<MediaType> defaultCharsetMediaTypes = [
     MediaType("text", "plain", charset: "utf-8"),
     MediaType("text", "html", charset: "utf-8"),
+    MediaType("text", "javascript", charset: "utf-8"),
+    MediaType("text", "css", charset: "utf-8"),
     MediaType("application", "json", charset: "utf-8"),
     MediaType("application", "problem+json", charset: "utf-8"),
     MediaType("application", "xml", charset: "utf-8"),
@@ -61,9 +63,10 @@ class MediaType {
   final String subtype;
   final Map<String, String> parameters;
 
-  MediaType(this.type, this.subtype, {this.parameters = const {}, String? charset}) {
+  MediaType(this.type, this.subtype, {Map<String, String>? parameters, String? charset})
+      : parameters = parameters ?? {} {
     if (charset != null) {
-      parameters["charset"] = charset;
+      this.parameters["charset"] = charset;
     }
   }
 
diff --git a/lib/network/http/http.dart b/lib/network/http/http.dart
index 367eb2d..947744b 100644
--- a/lib/network/http/http.dart
+++ b/lib/network/http/http.dart
@@ -83,7 +83,7 @@ abstract class HttpMessage {
   String? get charset {
     var contentType = headers.contentType;
     if (contentType.isEmpty) {
-      return null;
+      return 'utf-8';
     }
 
     MediaType mediaType = MediaType.valueOf(contentType);
diff --git a/linux/build.sh b/linux/build.sh
index bc4a262..f95b290 100644
--- a/linux/build.sh
+++ b/linux/build.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 
+
 pwd
 cd ../build/linux/x64/release
 rm -rf package