From 01c058ed1bf23e688af8350cf005725aa2881599 Mon Sep 17 00:00:00 2001
From: Hugo Romano <hugoromano@gmail.com>
Date: Tue, 17 Nov 2020 15:35:49 +0000
Subject: [PATCH] PoP location detection

---
 src/functions/cronTrigger.js | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/functions/cronTrigger.js b/src/functions/cronTrigger.js
index 6deee6c..da7082c 100644
--- a/src/functions/cronTrigger.js
+++ b/src/functions/cronTrigger.js
@@ -64,10 +64,11 @@ export async function processCronTrigger(event) {
   }
 
   // save last check timestamp including PoP location
-  const res = await fetch("https://www.cloudflare.com/cdn-cgi/trace")
-  const resText = await res.text()
-  const loc = /loc=([\w]{2})/.exec(resText)[1]
-  await setKV('lastUpdate', Date.now(), {loc})
+  const res = await fetch('https://cloudflare-dns.com/dns-query', {
+    method: 'OPTIONS',
+  })
+  const loc = res.headers.get('cf-ray').split('-')[1]
+  await setKV('lastUpdate', Date.now(), { loc })
 
   // gc monitor statuses
   event.waitUntil(gcMonitors(config))