I need to add custom css in head dynamically, where css url is dynamic. 

I can add using below code but page will get cache, I need to add css dynamically each page re-fresh, css url will be also changed.

```
<body>
        <referenceBlock name="head.additional">
            <block class="NAMESPACE\CUSTOMMODULE\Block\CustomCss" name="custom_css" template="customCss.phtml" before="-"/>
        </referenceBlock>
    </body>

```

Its some thing like CDN. Each time when css changed my custom css URL also change.