Documentation - v7.8.0
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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",
        "cf-cache-status",
        "x-vercel-cache",
    ] = ...

    Default list of headers collected on resource events when trackResourceHeaders is set to true.