CORS POC

Proving Cloudflare → Apps Script → Sheets

Before testing: paste your deployed Apps Script /exec URL into the field below (or hard-code it in the script). Then run the three tests in order.

Apps Script URL

Test 1 · GET ping (can we read JSON?)

Test 2 · POST add (can we write to the Sheet?)

Test 3 · GET list (can we read it back?)