Documentation - v7.1.0
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    Variable DEFAULT_TRACKED_RESOURCE_HEADERSConst

    DEFAULT_TRACKED_RESOURCE_HEADERS: readonly [
        "cache-control",
        "etag",
        "age",
        "expires",
        "content-type",
        "content-encoding",
        "vary",
        "content-length",
        "server-timing",
        "x-cache",
    ] = ...

    Default list of headers collected on resource events when trackResourceHeaders is set to true. Re-exported by the @datadog/browser-rum and @datadog/browser-rum-slim packages, and exposed on the DD_RUM global object when the SDK is loaded via the CDN, so it can be referenced when building a custom matcher list.

    import { datadogRum, DEFAULT_TRACKED_RESOURCE_HEADERS } from '@datadog/browser-rum'

    datadogRum.init({
      // ...
      trackResourceHeaders: [
        ...DEFAULT_TRACKED_RESOURCE_HEADERS.map((name) => ({ name })),
        { name: 'x-request-id' },
      ],
    })

    DD_RUM.init({
      // ...
      trackResourceHeaders: [
        ...DD_RUM.DEFAULT_TRACKED_RESOURCE_HEADERS.map((name) => ({ name })),
        { name: 'x-request-id' },
      ],
    })

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