add default redirect behaviour

lib/send.js

@@ -259,6 +259,22 @@ SendStream.prototype.isFresh = function(){
   return fresh(this.req.headers, this.res._headers);
 };
 
+/**
+ * Redirect to `path`.
+ *
+ * @param {String} path
+ * @api private
+ */
+
+SendStream.prototype.redirect = function(path){
+  if (this.listeners('directory').length) return this.emit('directory');
+  var res = this.res;
+  path += '/';
+  res.statusCode = 301;
+  res.setHeader('Location', path);
+  res.end('Redirecting to ' + utils.escape(path));
+};
+
 /**
  * Pipe to `res.
  *
@@ -302,7 +318,7 @@ SendStream.prototype.pipe = function(res){
   debug('stat "%s"', path);
   fs.stat(path, function(err, stat){
     if (err) return self.onStatError(err);
-    if (stat.isDirectory()) return self.emit('directory', stat);
+    if (stat.isDirectory()) return self.redirect(self.path);
     self.send(path, stat);
   });
 

test/send.js

@@ -114,11 +114,27 @@ describe('send(file).pipe(res)', function(){
     .end(done);
   })
 
+  describe('when no "directory" listeners are present', function(){
+    it('should respond with a redirect', function(done){
+      var app = http.createServer(function(req, res){
+        send(req.url)
+        .root('test/fixtures')
+        .pipe(res);
+      });
+
+      request(app)
+      .get('/pets')
+      .expect(301)
+      .expect('Location', '/pets/')
+      .expect('Redirecting to /pets/')
+      .end(done);
+    })
+  })
+
   describe('when no "error" listeners are present', function(){
     it('should respond to errors directly', function(done){
       var app = http.createServer(function(req, res){
-        send('test/fixtures' + req.url)
-        .pipe(res);
+        send('test/fixtures' + req.url).pipe(res);
       });
 
       request(app)