Fix handling errors from setting cookie

HISTORY.md

@@ -2,6 +2,7 @@ unreleased
 ==========
 
   * Add `priority` to `cookie` options
+  * Fix handling errors from setting cookie
   * Support any type in `secret` that `crypto.createHmac` supports
   * deps: cookie@0.5.0
     - Fix `expires` option to reject invalid dates

index.js

@@ -240,7 +240,11 @@ function session(options) {
       }
 
       // set cookie
-      setcookie(res, name, req.sessionID, secrets[0], req.session.cookie.data);
+      try {
+        setcookie(res, name, req.sessionID, secrets[0], req.session.cookie.data)
+      } catch (err) {
+        defer(next, err)
+      }
     });
 
     // proxy end() to commit the session

test/session.js

@@ -1945,6 +1945,23 @@ describe('session()', function(){
             .expect(200, done)
         })
 
+        it('should forward errors setting cookie', function (done) {
+          var cb = after(2, done)
+          var server = createServer({ cookie: { expires: new Date(NaN) } }, function (req, res) {
+            res.end()
+          })
+
+          server.on('error', function onerror (err) {
+            assert.ok(err)
+            assert.strictEqual(err.message, 'option expires is invalid')
+            cb()
+          })
+
+          request(server)
+            .get('/admin')
+            .expect(200, cb)
+        })
+
         it('should preserve cookies set before writeHead is called', function(done){
           var server = createServer(null, function (req, res) {
             var cookie = new Cookie()