adding undici demo

Author: Rolando Santamaria Maso

README.md

@@ -67,6 +67,7 @@ This flag could controls the settings of the undici client, like so:
   }
 ...
 ```
+> See undici demo at: `demos/gateway-undici.js`
 
 #### cacheURLs
 The number of parsed URLs that will be cached. Default: 100.

demos/gateway-undici.js

@@ -0,0 +1,20 @@
+'use strict'
+
+const { proxy } = require('../index')({
+  base: 'http://127.0.0.1:3000',
+  undici: {
+    connections: 100,
+    pipelining: 10
+  }
+})
+
+const service = require('restana')()
+service.all('/service/*', (req, res) => proxy(req, res, req.url, {
+  rewriteRequestHeaders (req, headers) {
+    delete headers.connection
+
+    return headers
+  }
+}))
+
+service.start(8080)