1 files changed, 21 insertions, 0 deletions
diff --git a/net/file_server.ts b/net/file_server.ts
index 3d14934db..aaaec64d5 100755
--- a/net/file_server.ts
+++ b/net/file_server.ts
@@ -12,6 +12,8 @@ import {
   Response
 } from "./http.ts";
 import { cwd, DenoError, ErrorKind, args, stat, readDir, open } from "deno";
+import { extname } from "../path/index.ts";
+import * as extensionsMap from "./extension_map.json";
 
 const dirViewerTemplate = `
 <!DOCTYPE html>
@@ -160,11 +162,30 @@ async function serveDir(req: ServerRequest, dirPath: string, dirName: string) {
   return res;
 }
 
+function guessContentType(filename: string): string {
+  let extension = extname(filename);
+  let contentType = extensionsMap[extension];
+
+  if (contentType) {
+    return contentType;
+  }
+
+  extension = extension.toLowerCase();
+  contentType = extensionsMap[extension];
+
+  if (contentType) {
+    return contentType;
+  }
+
+  return extensionsMap[''];
+}
+
 async function serveFile(req: ServerRequest, filename: string) {
   const file = await open(filename);
   const fileInfo = await stat(filename);
   const headers = new Headers();
   headers.set("content-length", fileInfo.len.toString());
+  headers.set("content-type", guessContentType(filename));
 
   const res = {
     status: 200,