code: func (ctx *Context) ChangeStaticPath(oldPath, newPath string) {
  	if !filepath.IsAbs(oldPath) {
  		oldPath = filepath.Join(Root, oldPath)
  	}
  	dir := statics.Get(oldPath)
  	if dir != nil {
  		statics.Delete(oldPath)
  
  		if !filepath.IsAbs(newPath) {
  			newPath = filepath.Join(Root, newPath)
  		}
  		*dir = http.Dir(newPath)
  		statics.Set(dir)
  	}
  }
docs: // ChangeStaticPath changes static path from old to new one.