I had the need to render completely different HTML depending on the HTTP method used to reach an Astro page.

I used this technique:

---
//... some server side logic
---

{Astro.request.method === 'POST' && 
  <div>
    //...
  </div>
}

{Astro.request.method === 'DELETE' && 
  <div>
    //...
  </div>
}

{Astro.request.method === 'GET' && 
  <div>
    //...
  </div>
}