diff --git a/Cargo.toml b/Cargo.toml
index 840972c..bbe29fb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,3 +37,12 @@ path-dedot = "1"
 default = ["native-tls"]
 only-openssl = ["native-tls", "openssl"]
 native-tls = ["hyper-native-tls"]
+
+
+[profile.release]
+opt-level = 3  # 最高优化级别
+lto = true      # 链接时优化
+codegen-units = 1 # 尽可能合并代码生成单元
+panic = 'abort' # 恐慌时立即终止，而不是展开（减小二进制大小）
+strip = true  # 从二进制文件中删除调试信息
+
diff --git a/src/main.rs b/src/main.rs
index 038be55..42efd25 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -919,8 +919,17 @@ impl MainHandler {
         }
         // Set mime type
         let mime = mime_types::from_path(path).first_or_octet_stream();
-        resp.headers
-            .set_raw("content-type", vec![mime.to_string().into_bytes()]);
+
+        // Fix messy code for non english issue: explicitly specify UTF-8 encoding for text files
+        let content_type = if mime.type_() == "text" {
+            format!("{}; charset=utf-8", mime)
+        } else if mime.type_() == "application" && mime.subtype() == "x-yaml" {
+            format!("text/yaml; charset=utf-8")
+        } else {
+            mime.to_string()
+        };
+        resp.headers.set_raw("content-type", vec![content_type.into_bytes()]);
+
         if self.coop {
             resp.headers.set_raw(
                 "Cross-Origin-Opener-Policy",
diff --git a/tests/hello.txt b/tests/hello.txt
new file mode 100644
index 0000000..84bd9f0
--- /dev/null
+++ b/tests/hello.txt
@@ -0,0 +1,7 @@
+Language (English)	"Hello, World!" Translation
+English	Hello, World!
+Chinese (Simplified)	你好，世界！ (Nǐ hǎo, shìjiè!)
+Russian	Здравствуй, мир! (Zdravstvuy, mir!)
+Japanese	こんにちは、世界！ (Konnichiwa, sekai!)
+
+