IIS搜索引擎优化与动态图像规范Url

我的动态图像生成器出现以下错误。它可以有任何类型的宽度或高度，但SEO抱怨它，因为它需要一个规范的URL。我如何处理一个不是页面的动态图像

The page with URL "http://localhost/assets/images/99?w=125" can also be accessed by using URL "http://localhost/assets/images/99?w=100".
Search engines identify unique pages by using URLs.  When a single page can be accessed by using any one of multiple URLs, a search engine assumes that there are multiple unique pages. Use a single URL to reference a page to prevent dilution of page relevance. You can prevent dilution by following a standard URL format.

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canonical

URL也可以在HTTP头中指定。见，第4节：

或者，在HTTP标头字段中，如中所述：

链接：；rel=“canonical”