fix base url origin stripping

Author: yyx990803

src/history/base.js

@@ -193,6 +193,8 @@ function normalizeBase (base: ?string): string {
       // respect <base> tag
       const baseEl = document.querySelector('base')
       base = (baseEl && baseEl.getAttribute('href')) || '/'
+      // strip full URL origin
+      base = base.replace(/^https?:\/\/[^\/]+/, '')
     } else {
       base = '/'
     }