proxy rewrites: fixed a case where errors were thrown if the resolved 'to' address contained params (e.g. '*', ':param' etc)

lib/middleware.js

@@ -33,14 +33,6 @@ function proxyRequest (route, app) {
         .replace(re, arguments[index + 1] || '')
     })
 
-    /* test no keys remain in the new path */
-    keys.length = 0
-    pathToRegexp(url.parse(route.new).path, keys)
-    if (keys.length) {
-      this.throw(500, `[PROXY] Invalid target URL: ${route.new}`)
-      return next()
-    }
-
     this.response = false
     debug('proxy request', `from: ${this.path}, to: ${url.parse(route.new).href}`)