Cloudflare

// Cloudflare HTTP Router, Replace forward URL with your CNAME collector.
// And adjust pathname so a path that doesn't currently exist (this will be your Snowplow collector)
addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

async function handleRequest(request) {
  const url = new URL(request.url)
  const { pathname } = url

  // Change the path to what you want your collector to be.
  if (pathname.startsWith('/COLLECTORPATH')) {

    const forwardUrl = 'https://worker-prod-collector.YOURSITE.COM/com.snowplowanalytics.snowplow/tp2'
    const headers = new Headers(request.headers)

    // Remove Cloudflare specific headers that should not be forwarded
    headers.delete('CF-Connecting-IP')
    headers.delete('CF-IPCountry')
    headers.delete('CF-Ray')
    headers.delete('CF-Visitor')
    headers.delete('CF-Request-ID')

    const forwardRequest = new Request(forwardUrl, {
      method: request.method,
      headers: headers,
      body: request.body,
      redirect: 'manual',
    })

    const forwardResponse = await fetch(forwardRequest)

    // Copy the response headers from the forwarded response
    const responseHeaders = new Headers(forwardResponse.headers)
    responseHeaders.delete('content-security-policy-report-only')
    responseHeaders.delete('content-security-policy')

    // Modify the Cache-Control header to add max-age=0
    responseHeaders.set('Cache-Control', 'max-age=0, ' + headers.get('Cache-Control'))
 
    // Return the forwarded response with its original headers
    return new Response(forwardResponse.body, {
      status: forwardResponse.status,
      statusText: forwardResponse.statusText,
      headers: responseHeaders,
    })
  } else {
    const response = await fetch(request)
    return response
  }
}

// Note how it points to www.yoursite.com
snowplow("newTracker", "spc", "www.YOURSITE.COM", {
        appId: "aid",
        discoverRootDomain: true,
        postPath: '/COLLECTORPATH', // Collector path override
        cookieSameSite: "Lax", // Recommended
        eventMethod: "post",
        bufferSize: 1,
        cookieLifetime: 63072000,
        stateStorageStrategy: "cookieAndLocalStorage",
        contexts: {
          webPage: true,
          performanceTiming: true,
        },
      });