add support serve root folder fixed #4

index.js

@@ -9,11 +9,17 @@ module.exports = function serve(path, root) {
     return function(ctx, next) {
         if(ctx.method == "HEAD" || ctx.method == "GET") {
 
-            let pathArr = ctx.path.slice(1).split("/");
+            let req_path_array = ctx.path.slice(1).split("/");
 
             // match path
-            if(path == pathArr[0]) {
-                return send(ctx, pathArr.slice(1).join("/"), {root: root}).then(() => {
+            if(path.length == 0 || path == req_path_array[0]) {
+                // if not serve the root
+                // then remove the filtered folder from path
+                if(path.length != 0) {
+                    req_path_array = req_path_array.slice(1);
+                }
+
+                return send(ctx, req_path_array.join("/"), {root: root}).then(() => {
                     return next();
                 });
             }

test/test.js

@@ -15,4 +15,12 @@ describe("Koa-static2", () => {
             .expect(200, "text content\n", done)
     });
 
+    it("should work when serve the root path", done => {
+        const app = new Koa();
+        app.use(serve("/", __dirname));
+
+        request(app.listen())
+            .get("/some.txt")
+            .expect(200, "text content\n", done)
+    });
 });