Test bypassing Fastly for the Discussions, Packages, and Actions product families (#17611)

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

Author: JamesMGreene

middleware/set-fastly-cache-headers.js

@@ -1,7 +1,19 @@
 const FASTLY_TTL = process.env.FASTLY_TTL || String(60 * 60 * 24) // 24 hours
 const STALE_TTL = String(60 * 10) // 10 minutes
 
+const BYPASS_FASTLY = process.env.TEST_BYPASS_FASTLY === 'true'
+const BYPASS_PRODUCTS = /^\/([a-z]{2})\/([a-z0-9._-]+@[a-z0-9._-]+\/)?(discussions|packages|actions)(\/.*|$)/i
+
 module.exports = (req, res, next) => {
+  // Test bypassing Fastly for all pages inside of the Discussions product
+  if (BYPASS_FASTLY && BYPASS_PRODUCTS.test(req.originalUrl)) {
+    res.set({
+      'surrogate-control': 'private, no-store',
+      'cache-control': 'private, no-store'
+    })
+    return next()
+  }
+
   res.set({
 
     // Say you want Fastly to cache your content but you don't want it cached by browsers.