Use response builder

src/routes.rs

@@ -106,9 +106,10 @@ pub fn render_response(
 
     let html = render_template(template, &context)?;
 
-    let mut res = Response::new(StatusCode::Ok);
-    res.set_body(html);
-    res.set_content_type(mime::HTML);
+    let res = Response::builder(StatusCode::Ok)
+        .body(html)
+        .content_type(mime::HTML)
+        .build();
 
     Ok(res)
 }