Fix regression routing a large stack in a single route

fixes #4913

History.md

@@ -1,3 +1,8 @@
+unreleased
+==========
+
+  * Fix regression routing a large stack in a single route
+
 4.18.1 / 2022-04-29
 ===================
 

lib/router/route.js

@@ -124,21 +124,21 @@ Route.prototype.dispatch = function dispatch(req, res, done) {
       return done(err)
     }
 
-    var layer = stack[idx++];
-    if (!layer) {
-      return done(err);
-    }
-
     // max sync stack
     if (++sync > 100) {
       return setImmediate(next, err)
     }
 
-    if (layer.method && layer.method !== method) {
-      return next(err);
+    var layer = stack[idx++]
+
+    // end of layers
+    if (!layer) {
+      return done(err)
     }
 
-    if (err) {
+    if (layer.method && layer.method !== method) {
+      next(err)
+    } else if (err) {
       layer.handle_error(err, req, res, next);
     } else {
       layer.handle_request(req, res, next);

test/Route.js

@@ -19,8 +19,16 @@ describe('Route', function(){
     var req = { method: 'GET', url: '/' }
     var route = new Route('/foo')
 
+    route.get(function (req, res, next) {
+      req.counter = 0
+      next()
+    })
+
     for (var i = 0; i < 6000; i++) {
-      route.all(function (req, res, next) { next() })
+      route.all(function (req, res, next) {
+        req.counter++
+        next()
+      })
     }
 
     route.get(function (req, res, next) {
@@ -31,6 +39,7 @@ describe('Route', function(){
     route.dispatch(req, {}, function (err) {
       if (err) return done(err)
       assert.ok(req.called)
+      assert.strictEqual(req.counter, 6000)
       done()
     })
   })