file server content type headers

util/contentType.ts

@@ -0,0 +1,26 @@
+export function getContentTypeByExtension(extension: string) {
+  switch (extension) {
+    case "html":
+    case "htm":
+      return "text/html";
+    case "css":
+      return "text/css";
+    case "js":
+      return "text/javascript";
+    case "json":
+      return "application/json";
+    case "png":
+      return "image/png";
+    case "jpg":
+    case "jpeg":
+      return "image/jpeg";
+    case "gif":
+      return "image/gif";
+    case "svg":
+      return "image/svg+xml";
+    case "txt":
+      return "text/plain";
+    default:
+      return "application/octet-stream";
+  }
+}