How to access clientAddress in Astro api routes?

I know that we can access user’s IP address in Astro using Astro.clientAddress value but this would only work in .astro pages.

// your-ip.astro

---
const detectedIp = Astro.clientAddress;
---

<h1>
Your IP: {{ detectedIP }}
</h1>

but in my case, I have created a server-side API endpoint in Astro itself so like below.

// pages/api/create-user.ts

export async function post({ request }) {
    console.log(await request.json());


    // I want to do like this in typescript endpoint file
    // const IP = Astro.clientAddress;


    return {
        body: JSON.stringify({
            name: 'Astro',
            url: 'https://astro.build/',
            ip: `Your IP: {IP}`
        }),
    };
}

I want to access the user’s IP address within this typescript file itself, but I think Astro is not provided in the .ts file context. So how to achieve that?

I looked at documentation around it but couldn’t find out how to access that.