405 not allowed method

lib/create-app.js

@@ -117,6 +117,33 @@ function createApp (argv = {}) {
   // Attach the LDP middleware
   app.use('/', LdpMiddleware(corsSettings))
 
+  // https://stackoverflow.com/questions/51741383/nodejs-express-return-405-for-un-supported-method
+  app.use(function (req, res, next) {
+    const AllLayers = app._router.stack
+    const Layers = AllLayers.filter(x => x.name === 'bound dispatch' && x.regexp.test(req.path))
+
+    const Methods = []
+    Layers.forEach(layer => {
+      for (const method in layer.route.methods) {
+        if (layer.route.methods[method] === true) {
+          Methods.push(method.toUpperCase())
+        }
+      }
+    })
+
+    if (Layers.length !== 0 && !Methods.includes(req.method)) {
+      // res.setHeader('Allow', Methods.join(','))
+
+      if (req.method === 'OPTIONS') {
+        return res.send(Methods.join(', '))
+      } else {
+        return res.status(405).send()
+      }
+    } else {
+      next()
+    }
+  })
+
   // Errors
   app.use(errorPages.handler)
 

test/integration/http-test.js

@@ -197,6 +197,21 @@ describe('HTTP APIs', function () {
     })
   })
 
+  describe('Not allowed method should return 405 and allow header', function (done) {
+    it('TRACE should return 405', function (done) {
+      server.trace('/sampleContainer2/')
+        // .expect(hasHeader('allow', 'OPTIONS, HEAD, GET, PATCH, POST, PUT, DELETE'))
+        .expect(405)
+        .end((err, res) => {
+          if (err) done(err)
+          const allow = res.headers.allow
+          console.log(allow)
+          if (allow === 'OPTIONS, HEAD, GET, PATCH, POST, PUT, DELETE') done()
+          else done(new Error('no allow header'))
+        })
+    })
+  })
+
   describe('GET API', function () {
     it('should have the same size of the file on disk', function (done) {
       server.get('/sampleContainer/solid.png')