add ENOENT err.code support for 404

lib/context.js

@@ -599,17 +599,18 @@ module.exports = {
     // delegate
     this.app.emit('error', err, this);
 
-    // err.status support
-    if (err.status) {
-      this.status = err.status;
-      this.res.end(http.STATUS_CODES[err.status]);
-      return;
-    }
+    // force text/plain
+    this.type = 'text';
+
+    // ENOENT support
+    if ('ENOENT' == err.code) err.status = 404;
+
+    // default to 500
+    err.status = err.status || 500;
 
     // respond
-    this.status = 500;
-    this.type = 'text';
-    this.res.end('Internal Server Error');
+    this.status = err.status;
+    this.res.end(http.STATUS_CODES[err.status]);
   },
 
   /**

test/application.js

@@ -178,7 +178,7 @@ describe('app.respond', function(){
       request(server)
       .get('/')
       .expect('Content-Type', 'text/plain')
-      .expect(500)
+      .expect(404)
       .end(done);
     })
   })