Fix the route redirect error when we've multiple path params. (#2652)

For an example, with a URL like: /static/data/hello.txt

server/index.js

@@ -200,17 +200,19 @@ export default class Server {
       },
 
       // It's very important keep this route's param optional.
+      // (but it should support as many as params, seperated by '/')
       // Othewise this will lead to a pretty simple DOS attack.
       // See more: https://github.com/zeit/next.js/issues/2617
-      '/_next/:path?': async (req, res, params) => {
+      '/_next/:path*': async (req, res, params) => {
         const p = join(__dirname, '..', 'client', ...(params.path || []))
         await this.serveStatic(req, res, p)
       },
 
       // It's very important keep this route's param optional.
+      // (but it should support as many as params, seperated by '/')
       // Othewise this will lead to a pretty simple DOS attack.
       // See more: https://github.com/zeit/next.js/issues/2617
-      '/static/:path?': async (req, res, params) => {
+      '/static/:path*': async (req, res, params) => {
         const p = join(this.dir, 'static', ...(params.path || []))
         await this.serveStatic(req, res, p)
       }

test/integration/production/static/data/item.txt

@@ -0,0 +1 @@
+item

test/integration/production/test/index.test.js

@@ -107,6 +107,8 @@ describe('Production Usage', () => {
       // See: https://github.com/zeit/next.js/issues/2617
       await renderViaHTTP(appPort, '/_next/')
       await renderViaHTTP(appPort, '/static/')
+      const data = await renderViaHTTP(appPort, '/static/data/item.txt')
+      expect(data).toBe('item')
     })
   })