feat(middleware) no cache by default, enable using cache opt, Fix #15

Author: sorrycc

README.md

@@ -37,6 +37,10 @@ Enable log for requests, default `false`.
 
 Map pathname for debug. e.g. `paths: [['/a/b/c/', '']]`
 
+### cache
+
+Enable 304 cache.
+
 ## LICENSE
 
 Copyright (c) 2014 sorrycc. Licensed under the MIT license.

lib/koa.js

@@ -58,12 +58,14 @@ module.exports = function(root, opts) {
       return yield* next;
     }
 
-    var modifiedTime = util.getModifiedTime(file);
-    this.set('Last-Modified', modifiedTime);
-    if (!util.isModified(this.header, modifiedTime)) {
-      debug('file %s is not modified', file.path);
-      this.status = 304;
-      return;
+    if (opts.cache) {
+      var modifiedTime = util.getModifiedTime(file);
+      this.set('Last-Modified', modifiedTime);
+      if (!util.isModified(this.header, modifiedTime)) {
+        debug('file %s is not modified', file.path);
+        this.status = 304;
+        return;
+      }
     }
 
     log('>> ServeSPM %s < ./%s',

test/index.js

@@ -365,11 +365,19 @@ function wrap(server, middleware) {
     });
   });
 
-  it('isModified', function(done) {
+  it('isModified disable', function(done) {
     app = server();
     app.use(middleware(join(fixtures, 'parser')));
     request(app.listen())
     .get('/index.js')
+    .expect(200, done);
+  });
+
+  it('isModified enable', function(done) {
+    app = server();
+    app.use(middleware(join(fixtures, 'parser'), {cache:true}));
+    request(app.listen())
+    .get('/index.js')
     .set('if-modified-since', '2046 8-14 13:52:38')
     .expect(304, done);
   });