LogsApi failing in Cloudflare Pages - XMLHttpRequest is not defined

[filipStoklasa23]

Describe the bug
When attempting to use the @datadog/datadog-api-client library within a Cloudflare Pages Function to send logs, the request fails with the following error:

ReferenceError: XMLHttpRequest is not defined
This error occurs because the client library uses cross-fetch internally, which relies on XMLHttpRequest. However, XMLHttpRequest is not available in the Cloudflare Workers environment where Pages Functions run.

To Reproduce
Steps to reproduce the behavior:

1. Create Logs api instance and submit log in middleware of Nextjs app.

const clientApi = new HttpLibraryWithProxy();

    const configuration = client.createConfiguration({
      authMethods: { apiKeyAuth: DATADOG_API_KEY },
    });

    apiInstance = new v2.LogsApi(configuration);

...

.submitLog({ body: logItems })
    .then(() => console.log('Datadog logItems uploaded:', logItems))
    .catch((error) => console.error('Datadog logItems upload failed:', error, logItems));

2. Visit Cloudflare realtime logs and see the error

"message": [
        "Datadog logItems upload failed:",
        "ReferenceError: XMLHttpRequest is not defined",
...

Expected behavior
Logs are successfully sent to Datadog.

Environment and Versions:
next: 14.x.x
@cloudflare/next-on-pages: 1.13.8
vercel: 41.2.2

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