From 76522bdcf68b8dab9f5e1ac85e4881a33371dcae Mon Sep 17 00:00:00 2001
From: powerivq <poweriv.q@gmail.com>
Date: Wed, 22 May 2024 23:37:40 -0700
Subject: [PATCH] amp optimizer to support ampjs.org (not enabled as default)

---
 package-lock.json                             | 154 ++++++-------
 packages/optimizer/lib/AmpConstants.js        |   3 +-
 packages/optimizer/lib/RuntimeHostHelper.js   |   4 +-
 packages/optimizer/lib/extensionConfig.json   |   2 +-
 .../optimizer/lib/fetchRuntimeParameters.js   |  18 +-
 .../lib/transformers/AddMandatoryTags.js      | 216 +++++++++---------
 .../transformers/AmpStoryCssTransformer.js    |   4 +-
 .../lib/transformers/AutoExtensionImporter.js |   4 +-
 .../transformers/ReorderHeadTransformer.js    |   2 +-
 .../lib/transformers/RewriteAmpUrls.js        |  10 +-
 .../spec/helpers/validatorInstance.js         |   1 +
 .../expected_output.html                      |  13 ++
 .../keep-existing-tags-ampjs/input.html       |  10 +
 .../adds_lts_ampjs/expected_output.html       |  13 ++
 .../RewriteAmpUrls/adds_lts_ampjs/input.html  |  16 ++
 .../adds_preloads_ampjs/expected_output.html  |  13 ++
 .../adds_preloads_ampjs/input.html            |  11 +
 .../runtime-version/lib/RuntimeVersion.js     |   7 +-
 18 files changed, 293 insertions(+), 208 deletions(-)
 create mode 100644 packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/expected_output.html
 create mode 100644 packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/input.html
 create mode 100644 packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/expected_output.html
 create mode 100644 packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/input.html
 create mode 100644 packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/expected_output.html
 create mode 100644 packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/input.html

diff --git a/package-lock.json b/package-lock.json
index 8d5d17d6c..65878faa9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24887,15 +24887,15 @@
     },
     "packages/cache-list": {
       "name": "@ampproject/toolbox-cache-list",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "packages/cache-url": {
       "name": "@ampproject/toolbox-cache-url",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
         "punycode": "2.1.1",
@@ -24904,17 +24904,17 @@
     },
     "packages/cli": {
       "name": "@ampproject/toolbox-cli",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-linter": "2.8.10",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-runtime-fetch": "^2.8.0",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
-        "@ampproject/toolbox-update-cache": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-linter": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-runtime-fetch": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
+        "@ampproject/toolbox-update-cache": "2.9.0",
         "minimist": "1.2.6",
         "minimist-options": "4.1.0",
         "node-fetch": "2.6.7"
@@ -24925,7 +24925,7 @@
     },
     "packages/core": {
       "name": "@ampproject/toolbox-core",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
         "cross-fetch": "3.1.5",
@@ -24934,23 +24934,23 @@
     },
     "packages/cors": {
       "name": "@ampproject/toolbox-cors",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "packages/linter": {
       "name": "@ampproject/toolbox-linter",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-validator-rules": "2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-validator-rules": "2.9.0",
         "amphtml-validator": "1.0.35",
         "chalk": "4.1.0",
         "cheerio": "1.0.0-rc.5",
@@ -25053,13 +25053,13 @@
     },
     "packages/optimizer": {
       "name": "@ampproject/toolbox-optimizer",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-core": "2.8.0",
-        "@ampproject/toolbox-runtime-version": "2.8.0",
-        "@ampproject/toolbox-script-csp": "2.8.0",
-        "@ampproject/toolbox-validator-rules": "2.8.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
+        "@ampproject/toolbox-script-csp": "2.9.0",
+        "@ampproject/toolbox-validator-rules": "2.9.0",
         "abort-controller": "3.0.0",
         "cross-fetch": "3.1.5",
         "cssnano-simple": "2.0.0",
@@ -25085,21 +25085,21 @@
     },
     "packages/optimizer-docker": {
       "name": "toolbox-optimizer-docker",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-optimizer": "2.8.10",
+        "@ampproject/toolbox-optimizer": "2.9.0",
         "prom-client": "13.1.0"
       }
     },
     "packages/optimizer-express": {
       "name": "@ampproject/toolbox-optimizer-express",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
         "mime-types": "2.1.29",
         "whatwg-url": "8.4.0"
       }
@@ -25207,10 +25207,10 @@
     },
     "packages/page-experience": {
       "name": "@ampproject/toolbox-page-experience",
-      "version": "2.8.10",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-linter": "2.8.10",
+        "@ampproject/toolbox-linter": "2.9.0",
         "cheerio": "1.0.0-rc.5",
         "css-font-face-src": "1.0.0",
         "postcss": "8.2.8",
@@ -25239,12 +25239,12 @@
     },
     "packages/runtime-fetch": {
       "name": "@ampproject/toolbox-runtime-fetch",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
         "at-least-node": "1.0.0",
         "fs-extra": "9.1.0",
         "node-fetch": "2.6.7"
@@ -25272,30 +25272,30 @@
     },
     "packages/runtime-version": {
       "name": "@ampproject/toolbox-runtime-version",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "packages/script-csp": {
       "name": "@ampproject/toolbox-script-csp",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0"
     },
     "packages/update-cache": {
       "name": "@ampproject/toolbox-update-cache",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
         "jsrsasign": "10.5.25"
       }
     },
     "packages/validator-rules": {
       "name": "@ampproject/toolbox-validator-rules",
-      "version": "2.8.0",
+      "version": "2.9.0",
       "license": "Apache-2.0",
       "dependencies": {
         "cross-fetch": "3.1.5"
@@ -25354,7 +25354,7 @@
     "@ampproject/toolbox-cache-list": {
       "version": "file:packages/cache-list",
       "requires": {
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "@ampproject/toolbox-cache-url": {
@@ -25367,14 +25367,14 @@
     "@ampproject/toolbox-cli": {
       "version": "file:packages/cli",
       "requires": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-linter": "2.8.10",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-runtime-fetch": "^2.8.0",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
-        "@ampproject/toolbox-update-cache": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-linter": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-runtime-fetch": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
+        "@ampproject/toolbox-update-cache": "2.9.0",
         "minimist": "1.2.6",
         "minimist-options": "4.1.0",
         "node-fetch": "2.6.7"
@@ -25390,18 +25390,18 @@
     "@ampproject/toolbox-cors": {
       "version": "file:packages/cors",
       "requires": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "@ampproject/toolbox-linter": {
       "version": "file:packages/linter",
       "requires": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-validator-rules": "2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-validator-rules": "2.9.0",
         "amphtml-validator": "1.0.35",
         "chalk": "4.1.0",
         "cheerio": "1.0.0-rc.5",
@@ -25466,10 +25466,10 @@
     "@ampproject/toolbox-optimizer": {
       "version": "file:packages/optimizer",
       "requires": {
-        "@ampproject/toolbox-core": "2.8.0",
-        "@ampproject/toolbox-runtime-version": "2.8.0",
-        "@ampproject/toolbox-script-csp": "2.8.0",
-        "@ampproject/toolbox-validator-rules": "2.8.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
+        "@ampproject/toolbox-script-csp": "2.9.0",
+        "@ampproject/toolbox-validator-rules": "2.9.0",
         "abort-controller": "3.0.0",
         "cross-fetch": "3.1.5",
         "cssnano-simple": "2.0.0",
@@ -25532,9 +25532,9 @@
     "@ampproject/toolbox-optimizer-express": {
       "version": "file:packages/optimizer-express",
       "requires": {
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-optimizer": "2.8.10",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-optimizer": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
         "mime-types": "2.1.29",
         "whatwg-url": "8.4.0"
       },
@@ -25561,7 +25561,7 @@
     "@ampproject/toolbox-page-experience": {
       "version": "file:packages/page-experience",
       "requires": {
-        "@ampproject/toolbox-linter": "2.8.10",
+        "@ampproject/toolbox-linter": "2.9.0",
         "cheerio": "1.0.0-rc.5",
         "css-font-face-src": "1.0.0",
         "postcss": "8.2.8",
@@ -25582,9 +25582,9 @@
     "@ampproject/toolbox-runtime-fetch": {
       "version": "file:packages/runtime-fetch",
       "requires": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-core": "^2.8.0",
-        "@ampproject/toolbox-runtime-version": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-core": "2.9.0",
+        "@ampproject/toolbox-runtime-version": "2.9.0",
         "at-least-node": "1.0.0",
         "fs-extra": "9.1.0",
         "node-fetch": "2.6.7"
@@ -25607,7 +25607,7 @@
     "@ampproject/toolbox-runtime-version": {
       "version": "file:packages/runtime-version",
       "requires": {
-        "@ampproject/toolbox-core": "^2.8.0"
+        "@ampproject/toolbox-core": "2.9.0"
       }
     },
     "@ampproject/toolbox-script-csp": {
@@ -25616,8 +25616,8 @@
     "@ampproject/toolbox-update-cache": {
       "version": "file:packages/update-cache",
       "requires": {
-        "@ampproject/toolbox-cache-list": "^2.8.0",
-        "@ampproject/toolbox-cache-url": "^2.8.0",
+        "@ampproject/toolbox-cache-list": "2.9.0",
+        "@ampproject/toolbox-cache-url": "2.9.0",
         "jsrsasign": "10.5.25"
       }
     },
@@ -42416,7 +42416,7 @@
     "toolbox-optimizer-docker": {
       "version": "file:packages/optimizer-docker",
       "requires": {
-        "@ampproject/toolbox-optimizer": "2.8.10",
+        "@ampproject/toolbox-optimizer": "2.9.0",
         "prom-client": "13.1.0"
       }
     },
diff --git a/packages/optimizer/lib/AmpConstants.js b/packages/optimizer/lib/AmpConstants.js
index e8fd740bc..b8de0b61d 100644
--- a/packages/optimizer/lib/AmpConstants.js
+++ b/packages/optimizer/lib/AmpConstants.js
@@ -21,7 +21,8 @@ const AMP_STORY_DVH_POLYFILL_ATTR = 'amp-story-dvh-polyfill';
 
 module.exports = {
   AMP_TAGS: ['amp', '⚡', '⚡4ads', 'amp4ads', '⚡4email', 'amp4email'],
-  AMP_CACHE_HOST: 'https://cdn.ampproject.org',
+  AMP_CACHE_HOSTS: ['https://cdn.ampproject.org', 'https://ampjs.org'],
+  DEFAULT_AMP_CACHE_HOST: 'https://cdn.ampproject.org',
   AMP_VALIDATION_RULES_URL: 'https://cdn.ampproject.org/v0/validator.json',
   AMP_FORMATS: ['AMP', 'AMP4EMAIL', 'AMP4ADS'],
   AMP_RUNTIME_CSS_PATH: '/v0.css',
diff --git a/packages/optimizer/lib/RuntimeHostHelper.js b/packages/optimizer/lib/RuntimeHostHelper.js
index 75e6998bc..96c18d4b9 100644
--- a/packages/optimizer/lib/RuntimeHostHelper.js
+++ b/packages/optimizer/lib/RuntimeHostHelper.js
@@ -15,10 +15,10 @@
  */
 'use strict';
 
-const {AMP_CACHE_HOST, appendRuntimeVersion} = require('./AmpConstants.js');
+const {DEFAULT_AMP_CACHE_HOST, appendRuntimeVersion} = require('./AmpConstants.js');
 
 function calculateHost({
-  ampUrlPrefix = AMP_CACHE_HOST,
+  ampUrlPrefix = DEFAULT_AMP_CACHE_HOST,
   ampRuntimeVersion,
   lts = false,
   rtv = false,
diff --git a/packages/optimizer/lib/extensionConfig.json b/packages/optimizer/lib/extensionConfig.json
index ba0f78954..84dab49f7 100644
--- a/packages/optimizer/lib/extensionConfig.json
+++ b/packages/optimizer/lib/extensionConfig.json
@@ -1 +1 @@
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\ No newline at end of file
+[{"name":"amp-3d-gltf","version":"0.1","latestVersion":"0.1"},{"name":"amp-3q-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-access","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-access-fewcents","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-access-laterpay","version":["0.1","0.2"],"latestVersion":"0.2","options":{"hasCss":true}},{"name":"amp-access-poool","version":"0.1","latestVersion":"0.1"},{"name":"amp-access-scroll","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-accordion","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-accordion","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-action-macro","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-ad-custom","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-exit","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-adsense-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-adzerk-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-dianomi-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-doubleclick-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-fake-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-mgid-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-nws-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-smartadserver-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-ad-network-valueimpression-impl","version":"0.1","latestVersion":"0.1"},{"name":"amp-addthis","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-analytics","version":"0.1","latestVersion":"0.1"},{"name":"amp-anim","version":"0.1","latestVersion":"0.1"},{"name":"amp-animation","version":"0.1","latestVersion":"0.1"},{"name":"amp-animation-polyfill","version":"0.1","latestVersion":"0.1"},{"name":"amp-apester-media","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-app-banner","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-app-banner","version":"1.0","options":{"hasCss":true}},{"name":"amp-audio","version":"0.1","latestVersion":"0.1"},{"name":"amp-audio","version":"1.0","latestVersion":"0.1","options":{}},{"name":"amp-auto-ads","version":"0.1","latestVersion":"0.1"},{"name":"amp-auto-lightbox","version":"0.1","latestVersion":"0.1"},{"name":"amp-autocomplete","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-base-carousel","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-base-carousel","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-beopinion","version":"0.1","latestVersion":"0.1"},{"name":"amp-bind","version":"0.1","latestVersion":"0.1"},{"name":"amp-bodymovin-animation","version":"0.1","latestVersion":"0.1"},{"name":"amp-brid-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-brightcove","version":"0.1","latestVersion":"0.1"},{"name":"amp-brightcove","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-byside-content","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-cache-url","version":"0.1","latestVersion":"0.1"},{"name":"amp-call-tracking","version":"0.1","latestVersion":"0.1"},{"name":"amp-carousel","version":["0.1","0.2"],"latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-connatix-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-consent","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-crypto-polyfill","version":"0.1","latestVersion":"0.1"},{"name":"amp-dailymotion","version":"0.1","latestVersion":"0.1"},{"name":"amp-dailymotion","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-date-countdown","version":"0.1","latestVersion":"0.1"},{"name":"amp-date-countdown","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-date-display","version":"0.1","latestVersion":"0.1"},{"name":"amp-date-display","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-date-picker","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-date-picker","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-delight-player","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-dynamic-css-classes","version":"0.1","latestVersion":"0.1"},{"name":"amp-embedly-card","version":"0.1","latestVersion":"0.1"},{"name":"amp-embedly-card","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-experiment","version":["0.1","1.0"],"latestVersion":"0.1"},{"name":"amp-facebook","version":"0.1","latestVersion":"0.1"},{"name":"amp-facebook","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-facebook-comments","version":"0.1","latestVersion":"0.1"},{"name":"amp-facebook-like","version":"0.1","latestVersion":"0.1"},{"name":"amp-facebook-page","version":"0.1","latestVersion":"0.1"},{"name":"amp-fit-text","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-fit-text","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-font","version":"0.1","latestVersion":"0.1"},{"name":"amp-form","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-fx-collection","version":"0.1","latestVersion":"0.1"},{"name":"amp-fx-flying-carpet","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-geo","version":"0.1","latestVersion":"0.1"},{"name":"amp-gfycat","version":"0.1","latestVersion":"0.1"},{"name":"amp-gist","version":"0.1","latestVersion":"0.1"},{"name":"amp-gist","version":"1.0","options":{"hasCss":true}},{"name":"amp-google-document-embed","version":"0.1","latestVersion":"0.1"},{"name":"amp-google-read-aloud-player","version":"0.1"},{"name":"amp-gwd-animation","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-hulu","version":"0.1","latestVersion":"0.1"},{"name":"amp-iframe","version":"0.1","latestVersion":"0.1"},{"name":"amp-iframe","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-iframely","version":"0.1","latestVersion":"0.1"},{"name":"amp-ima-video","version":"0.1","latestVersion":"0.1"},{"name":"amp-image-lightbox","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-image-slider","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-image-slider","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-image-viewer","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-imgur","version":"0.1","latestVersion":"0.1"},{"name":"amp-inline-gallery","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-inline-gallery","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-inputmask","version":"0.1","latestVersion":"0.1"},{"name":"amp-instagram","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-instagram","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-install-serviceworker","version":"0.1","latestVersion":"0.1"},{"name":"amp-intersection-observer-polyfill","version":"0.1","latestVersion":"0.1"},{"name":"amp-izlesene","version":"0.1","latestVersion":"0.1"},{"name":"amp-jwplayer","version":"0.1","latestVersion":"0.1"},{"name":"amp-jwplayer","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-kaltura-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-lightbox","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-lightbox","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-lightbox-gallery","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-lightbox-gallery","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-link-rewriter","version":"0.1","latestVersion":"0.1"},{"name":"amp-list","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-list","version":"1.0","options":{"hasCss":false}},{"name":"amp-live-list","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-loader","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-mathml","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-mathml","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-mega-menu","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-megaphone","version":"0.1","latestVersion":"0.1"},{"name":"amp-minute-media-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-mowplayer","version":"0.1","latestVersion":"0.1"},{"name":"amp-mraid","version":"0.1","latestVersion":"0.1"},{"name":"amp-mustache","version":["0.1","0.2"],"latestVersion":"0.2"},{"name":"amp-nested-menu","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-next-page","version":["0.1","1.0"],"latestVersion":"1.0","options":{"hasCss":true}},{"name":"amp-nexxtv-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-o2-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-onetap-google","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-ooyala-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-orientation-observer","version":"0.1","latestVersion":"0.1"},{"name":"amp-pan-zoom","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-pan-zoom","version":"1.0","options":{"hasCss":true}},{"name":"amp-pinterest","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-playbuzz","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-position-observer","version":"0.1","latestVersion":"0.1"},{"name":"amp-powr-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-reach-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-recaptcha-input","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-reddit","version":"0.1","latestVersion":"0.1"},{"name":"amp-render","version":"1.0","latestVersion":"1.0"},{"name":"amp-resize-observer-polyfill","version":"0.1","latestVersion":"0.1"},{"name":"amp-riddle-quiz","version":"0.1","latestVersion":"0.1"},{"name":"amp-script","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-selector","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-selector","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-shadow-dom-polyfill","version":"0.1","latestVersion":"0.1","options":{"wrapper":"none"}},{"name":"amp-sidebar","version":["0.1","0.2"],"latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-sidebar","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-skimlinks","version":"0.1","latestVersion":"0.1"},{"// 1":"`amp-slides` is deprecated","// 2":"Please use `<amp-carousel type=slides>` instead.","name":"amp-slides","version":"0.1","latestVersion":"0.1"},{"name":"amp-slikeplayer","version":"0.1","latestVersion":"0.1"},{"name":"amp-smartlinks","version":"0.1","latestVersion":"0.1"},{"name":"amp-social-share","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-social-share","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-soundcloud","version":"0.1","latestVersion":"0.1"},{"name":"amp-soundcloud","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-springboard-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-standalone","version":"0.1","latestVersion":"0.1"},{"name":"amp-sticky-ad","version":"1.0","latestVersion":"1.0","options":{"hasCss":true}},{"name":"amp-story","version":"1.0","latestVersion":"1.0","options":{"hasCss":true}},{"name":"amp-story","version":"1.0","latestVersion":"1.0","options":{"hasCss":false,"additionalSuffix":"ssr-css","ssrCss":true}},{"name":"amp-story-360","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-audio-sticker","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-auto-ads","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-auto-analytics","version":"0.1","latestVersion":"0.1"},{"name":"amp-story-captions","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-dev-tools","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-education","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-interactive","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-page-attachment","version":"0.1","options":{"hasCss":true}},{"name":"amp-story-panning-media","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-player","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-share-menu","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-shopping","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-story-subscriptions","version":"0.1","options":{"hasCss":true}},{"name":"amp-stream-gallery","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-stream-gallery","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-subscriptions","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-subscriptions-google","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-tiktok","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-timeago","version":"0.1","latestVersion":"0.1"},{"name":"amp-timeago","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-truncate-text","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-twitter","version":"0.1","latestVersion":"0.1"},{"name":"amp-twitter","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-user-notification","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-video","version":"0.1","latestVersion":"0.1"},{"name":"amp-video","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-video-docking","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-video-iframe","version":"0.1","latestVersion":"0.1"},{"name":"amp-video-iframe","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-viewer-integration","version":"0.1","latestVersion":"0.1","options":{"// 1":"The viewer integration code needs to run asap, so that viewers","// 2":"can influence document state asap. Otherwise the document may ","// 3":"take a long time to learn that it should start process other","// 4":"extensions faster.","loadPriority":"high"}},{"name":"amp-vimeo","version":"0.1","latestVersion":"0.1"},{"name":"amp-vimeo","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-vine","version":"0.1","latestVersion":"0.1"},{"name":"amp-viqeo-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-vk","version":"0.1","latestVersion":"0.1"},{"name":"amp-web-push","version":"0.1","latestVersion":"0.1","options":{"hasCss":true}},{"name":"amp-wistia-player","version":"0.1","latestVersion":"0.1"},{"name":"amp-wordpress-embed","version":"1.0","latestVersion":"1.0","options":{"hasCss":true}},{"name":"amp-yotpo","version":"0.1","latestVersion":"0.1"},{"name":"amp-youtube","version":"0.1","latestVersion":"0.1"},{"name":"amp-youtube","version":"1.0","latestVersion":"0.1","options":{"hasCss":true}}]
\ No newline at end of file
diff --git a/packages/optimizer/lib/fetchRuntimeParameters.js b/packages/optimizer/lib/fetchRuntimeParameters.js
index 770fecbbf..b99b8c1ff 100644
--- a/packages/optimizer/lib/fetchRuntimeParameters.js
+++ b/packages/optimizer/lib/fetchRuntimeParameters.js
@@ -29,10 +29,11 @@ try {
 }
 
 const {
-  AMP_CACHE_HOST,
+  AMP_CACHE_HOSTS,
   AMP_RUNTIME_CSS_PATH,
   AMP_VALIDATION_RULES_URL,
   appendRuntimeVersion,
+  DEFAULT_AMP_CACHE_HOST,
 } = require('./AmpConstants.js');
 
 const KEY_VALIDATOR_RULES = 'validator-rules';
@@ -214,12 +215,12 @@ async function fetchLatestRuntimeData_({config, ampUrlPrefix, lts}, versionKey =
     version: await config.runtimeVersion.currentVersion({ampUrlPrefix, lts}),
     maxAge: MaxAge.create(AMP_RUNTIME_MAX_AGE).toObject(),
   };
-  if (!ampRuntimeData.version && ampUrlPrefix && ampUrlPrefix !== AMP_CACHE_HOST) {
+  if (!ampRuntimeData.version && ampUrlPrefix && !AMP_CACHE_HOSTS.includes(ampUrlPrefix)) {
     config.log.error(
-      `Could not download runtime version from ${ampUrlPrefix}. Falling back to ${AMP_CACHE_HOST}`
+      `Could not download runtime version from ${ampUrlPrefix}. Falling back to ${DEFAULT_AMP_CACHE_HOST}`
     );
     ampRuntimeData = await fetchLatestRuntimeData_(
-      {config, ampUrlPrefix: AMP_CACHE_HOST, lts},
+      {config, ampUrlPrefix: DEFAULT_AMP_CACHE_HOST, lts},
       versionKey
     );
   } else if (!ampRuntimeData.version) {
@@ -240,15 +241,16 @@ async function fetchLatestRuntimeData_({config, ampUrlPrefix, lts}, versionKey =
 async function fetchAmpRuntimeStyles_(config, ampUrlPrefix, ampRuntimeVersion) {
   if (ampUrlPrefix && !isAbsoluteUrl_(ampUrlPrefix)) {
     config.log.warn(
-      `AMP runtime styles cannot be fetched from relative ampUrlPrefix, please use the 'ampRuntimeStyles' parameter to provide the correct runtime style. Falling back to latest v0.css on ${AMP_CACHE_HOST}`
+      `AMP runtime styles cannot be fetched from relative ampUrlPrefix, please use the 'ampRuntimeStyles' parameter to provide the correct runtime style. Falling back to latest v0.css on ${DEFAULT_AMP_CACHE_HOST}`
     );
     // Gracefully fallback to latest runtime version
-    ampUrlPrefix = AMP_CACHE_HOST;
+    ampUrlPrefix = DEFAULT_AMP_CACHE_HOST;
     ampRuntimeVersion = ampRuntimeVersion || (await config.runtimeVersion.currentVersion());
   }
   // Construct the AMP runtime CSS download URL, the default is: https://cdn.ampproject.org/rtv/${ampRuntimeVersion}/v0.css
   const runtimeCssUrl =
-    appendRuntimeVersion(ampUrlPrefix || AMP_CACHE_HOST, ampRuntimeVersion) + AMP_RUNTIME_CSS_PATH;
+    appendRuntimeVersion(ampUrlPrefix || DEFAULT_AMP_CACHE_HOST, ampRuntimeVersion) +
+    AMP_RUNTIME_CSS_PATH;
   // Fetch runtime styles
   const styles = await downloadAmpRuntimeStyles_(config, runtimeCssUrl);
   if (!styles) {
@@ -257,7 +259,7 @@ async function fetchAmpRuntimeStyles_(config, ampUrlPrefix, ampRuntimeVersion) {
       // Try to download latest from cdn.ampproject.org instead
       return fetchAmpRuntimeStyles_(
         config,
-        AMP_CACHE_HOST,
+        DEFAULT_AMP_CACHE_HOST,
         await config.runtimeVersion.currentVersion()
       );
     } else {
diff --git a/packages/optimizer/lib/transformers/AddMandatoryTags.js b/packages/optimizer/lib/transformers/AddMandatoryTags.js
index 372115030..e493f3441 100644
--- a/packages/optimizer/lib/transformers/AddMandatoryTags.js
+++ b/packages/optimizer/lib/transformers/AddMandatoryTags.js
@@ -24,117 +24,11 @@ const {
   createElement,
   firstChildByTag,
 } = require('../NodeUtils');
-const {AMP_FORMATS, AMP_TAGS} = require('../AmpConstants');
+const {AMP_FORMATS, AMP_TAGS, DEFAULT_AMP_CACHE_HOST} = require('../AmpConstants');
 
 const DEFAULT_FORMAT = 'AMP';
 const AUTO_GENERATED_MARKER = 'data-auto';
 
-const BOILERPLATES = {
-  AMP: [
-    {
-      matcher: {
-        tagName: 'meta',
-        attribs: {
-          charset: 'utf-8',
-        },
-      },
-      node: {
-        tagName: 'meta',
-        attribs: {
-          charset: 'utf-8',
-        },
-      },
-    },
-    {
-      matcher: {
-        tagName: 'meta',
-        attribs: {
-          name: 'viewport',
-        },
-      },
-      node: {
-        tagName: 'meta',
-        attribs: {
-          name: 'viewport',
-          content: 'width=device-width,minimum-scale=1,initial-scale=1',
-        },
-      },
-    },
-    {
-      matcher: {
-        tagName: 'noscript',
-      },
-      node: {
-        tagName: 'noscript',
-        children: [
-          {
-            tagName: 'style',
-            attribs: {
-              'amp-boilerplate': '',
-            },
-            // eslint-disable-next-line max-len
-            text:
-              'body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}',
-          },
-        ],
-      },
-    },
-    {
-      matcher: {
-        tagName: 'style',
-        attribs: {
-          'amp-boilerplate': '',
-        },
-      },
-      node: {
-        tagName: 'style',
-        attribs: {
-          'amp-boilerplate': '',
-        },
-        // eslint-disable-next-line max-len
-        text:
-          'body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}',
-      },
-    },
-    {
-      matcher: {
-        tagName: 'script',
-        attribs: {
-          src: /^https:\/\/.+\/v0\.js$/,
-        },
-      },
-      node: {
-        tagName: 'script',
-        attribs: {
-          async: '',
-          src: 'https://cdn.ampproject.org/v0.js',
-        },
-      },
-    },
-    {
-      matcher: {
-        tagName: 'link',
-        attribs: {
-          rel: 'canonical',
-        },
-      },
-      node: {
-        tagName: 'link',
-        attribs: {
-          rel: 'canonical',
-          href: (params, log) => {
-            if (!params.canonical) {
-              log.warn('No canonical param is given. Setting canonical href to `.`');
-              params.canonical = '.';
-            }
-            return params.canonical;
-          },
-        },
-      },
-    },
-  ],
-};
-
 /**
  * AddMandatoryTags - this transformer will automatically add all missing tags required by a valid AMP document.
  *
@@ -164,8 +58,114 @@ class AddMandatoryTags {
       return;
     }
 
+    const boilerplates = {
+      AMP: [
+        {
+          matcher: {
+            tagName: 'meta',
+            attribs: {
+              charset: 'utf-8',
+            },
+          },
+          node: {
+            tagName: 'meta',
+            attribs: {
+              charset: 'utf-8',
+            },
+          },
+        },
+        {
+          matcher: {
+            tagName: 'meta',
+            attribs: {
+              name: 'viewport',
+            },
+          },
+          node: {
+            tagName: 'meta',
+            attribs: {
+              name: 'viewport',
+              content: 'width=device-width,minimum-scale=1,initial-scale=1',
+            },
+          },
+        },
+        {
+          matcher: {
+            tagName: 'noscript',
+          },
+          node: {
+            tagName: 'noscript',
+            children: [
+              {
+                tagName: 'style',
+                attribs: {
+                  'amp-boilerplate': '',
+                },
+                // eslint-disable-next-line max-len
+                text:
+                  'body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}',
+              },
+            ],
+          },
+        },
+        {
+          matcher: {
+            tagName: 'style',
+            attribs: {
+              'amp-boilerplate': '',
+            },
+          },
+          node: {
+            tagName: 'style',
+            attribs: {
+              'amp-boilerplate': '',
+            },
+            // eslint-disable-next-line max-len
+            text:
+              'body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}',
+          },
+        },
+        {
+          matcher: {
+            tagName: 'script',
+            attribs: {
+              src: /^https:\/\/.+\/v0\.js$/,
+            },
+          },
+          node: {
+            tagName: 'script',
+            attribs: {
+              async: '',
+              src: (params.ampUrlPrefix || DEFAULT_AMP_CACHE_HOST) + '/v0.js',
+            },
+          },
+        },
+        {
+          matcher: {
+            tagName: 'link',
+            attribs: {
+              rel: 'canonical',
+            },
+          },
+          node: {
+            tagName: 'link',
+            attribs: {
+              rel: 'canonical',
+              href: (params, log) => {
+                if (!params.canonical) {
+                  log.warn('No canonical param is given. Setting canonical href to `.`');
+                  params.canonical = '.';
+                }
+                return params.canonical;
+              },
+            },
+          },
+        },
+      ],
+    };
+
     // Only supports AMP for websites
-    const boilerplateSpec = BOILERPLATES[this.format];
+    const boilerplateSpec = boilerplates[this.format];
     if (!boilerplateSpec) {
       this.log_.info('Unsupported AMP format', this.format);
       return;
diff --git a/packages/optimizer/lib/transformers/AmpStoryCssTransformer.js b/packages/optimizer/lib/transformers/AmpStoryCssTransformer.js
index c2c51d4a6..757f9e2fc 100644
--- a/packages/optimizer/lib/transformers/AmpStoryCssTransformer.js
+++ b/packages/optimizer/lib/transformers/AmpStoryCssTransformer.js
@@ -13,7 +13,7 @@ const {
   firstChildByTag,
   appendChild,
 } = require('../NodeUtils');
-const {AMP_CACHE_HOST} = require('../AmpConstants.js');
+const {DEFAULT_AMP_CACHE_HOST} = require('../AmpConstants.js');
 
 // This string should not be modified, even slightly. This string is strictly
 // checked by the validator.
@@ -139,7 +139,7 @@ function appendAmpStoryCssLink(head) {
     'amp-extension': 'amp-story',
     // We rely on the `RewriteAmpUrls` transformer to modify this to
     // the correct LTS or correct rtv path.
-    'href': `${AMP_CACHE_HOST}/v0/amp-story-1.0.css`,
+    'href': `${DEFAULT_AMP_CACHE_HOST}/v0/amp-story-1.0.css`,
   });
   appendChild(head, ampStoryCssLink);
 }
diff --git a/packages/optimizer/lib/transformers/AutoExtensionImporter.js b/packages/optimizer/lib/transformers/AutoExtensionImporter.js
index 30805829e..84d4a4228 100644
--- a/packages/optimizer/lib/transformers/AutoExtensionImporter.js
+++ b/packages/optimizer/lib/transformers/AutoExtensionImporter.js
@@ -23,7 +23,7 @@ const {
   hasAttribute,
 } = require('../NodeUtils');
 const {findMetaViewport, findRuntimeScript} = require('../HtmlDomHelper');
-const {AMP_FORMATS, AMP_CACHE_HOST} = require('../AmpConstants');
+const {AMP_FORMATS, DEFAULT_AMP_CACHE_HOST} = require('../AmpConstants');
 
 const BIND_SHORT_FORM_PREFIX = 'bind';
 const AMP_BIND_DATA_ATTRIBUTE_PREFIX = 'data-amp-bind-';
@@ -188,7 +188,7 @@ class AutoExtensionImporter {
     }
 
     // Use cdn.ampproject.org as default, RewriteUrlTransformer will change this in case of self-hosting
-    const host = AMP_CACHE_HOST;
+    const host = DEFAULT_AMP_CACHE_HOST;
     for (const extensionName of extensionsToImport) {
       if (existingImports.has(extensionName)) {
         continue;
diff --git a/packages/optimizer/lib/transformers/ReorderHeadTransformer.js b/packages/optimizer/lib/transformers/ReorderHeadTransformer.js
index 41be15925..3a5754815 100644
--- a/packages/optimizer/lib/transformers/ReorderHeadTransformer.js
+++ b/packages/optimizer/lib/transformers/ReorderHeadTransformer.js
@@ -191,7 +191,7 @@ class HeadNodes {
       rel === 'prefetch' ||
       rel === 'dns-prefetch' ||
       rel === 'preconnect' ||
-      rel == 'modulepreload'
+      rel === 'modulepreload'
     ) {
       this._resourceHintLinks.push(node);
       return;
diff --git a/packages/optimizer/lib/transformers/RewriteAmpUrls.js b/packages/optimizer/lib/transformers/RewriteAmpUrls.js
index 8b1109571..debfef6bd 100644
--- a/packages/optimizer/lib/transformers/RewriteAmpUrls.js
+++ b/packages/optimizer/lib/transformers/RewriteAmpUrls.js
@@ -23,7 +23,7 @@ const {
   insertBefore,
   remove,
 } = require('../NodeUtils');
-const {AMP_CACHE_HOST} = require('../AmpConstants.js');
+const {AMP_CACHE_HOSTS} = require('../AmpConstants.js');
 const {findMetaViewport} = require('../HtmlDomHelper');
 const {calculateHost} = require('../RuntimeHostHelper');
 
@@ -141,13 +141,15 @@ class RewriteAmpUrls {
 
   _usesAmpCacheUrl(url) {
     if (!url) {
-      return;
+      return false;
     }
-    return url.startsWith(AMP_CACHE_HOST);
+    // check if url starts with one of string array
+    return AMP_CACHE_HOSTS.some((host) => url.startsWith(host));
   }
 
   _replaceUrl(url, host) {
-    return host + url.substring(AMP_CACHE_HOST.length);
+    const existingHost = AMP_CACHE_HOSTS.find((ampCacheHost) => url.startsWith(ampCacheHost));
+    return host + url.substring(existingHost.length);
   }
 
   _addEsm(scriptNode, preloadEnabled) {
diff --git a/packages/optimizer/spec/helpers/validatorInstance.js b/packages/optimizer/spec/helpers/validatorInstance.js
index e93fa05af..b4a797c77 100644
--- a/packages/optimizer/spec/helpers/validatorInstance.js
+++ b/packages/optimizer/spec/helpers/validatorInstance.js
@@ -6,6 +6,7 @@ let instance = null;
 module.exports = {
   get: () => {
     if (!instance) {
+      console.error('Validator instance created: ' + path.join(__dirname, 'validator.js'));
       instance = validator.getInstance(path.join(__dirname, 'validator.js'));
     }
     return instance;
diff --git a/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/expected_output.html b/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/expected_output.html
new file mode 100644
index 000000000..168f7e570
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/expected_output.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html ⚡>
+<head>
+  <title>My AMP Page</title>
+  <link rel="canonical" href="self.html">
+  <script data-auto async src="https://ampjs.org/v0.js"></script>
+  <meta data-auto charset="utf-8">
+  <meta data-auto name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1"><noscript data-auto><style data-auto amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style></noscript><style data-auto amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style>
+</head>
+<body>
+  <h1>hello world</h1>
+</body>
+</html>
\ No newline at end of file
diff --git a/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/input.html b/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/input.html
new file mode 100644
index 000000000..801dd6079
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/AddMandatoryTags/keep-existing-tags-ampjs/input.html
@@ -0,0 +1,10 @@
+<html ⚡>
+<head>
+  <title>My AMP Page</title>
+  <link rel="canonical" href="self.html" />
+  <script data-auto async src="https://ampjs.org/v0.js"></script>
+</head>
+<body>
+  <h1>hello world</h1>
+</body>
+</html>
diff --git a/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/expected_output.html b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/expected_output.html
new file mode 100644
index 000000000..aa570f4cf
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/expected_output.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html ⚡>
+<head>
+  <script async custom-element="amp-experiment" src="https://cdn.ampproject.org/lts/v0/amp-experiment-0.1.js"></script>
+  <script async src="https://cdn.ampproject.org/lts/v0.js"></script>
+  <link rel="stylesheet" href="https://cdn.ampproject.org/lts/v0.css">
+  <link href="https://fonts.googleapis.com/css?foobar" rel="stylesheet" type="text/css">
+  <link href="https://example.com/favicon.ico" rel="icon">
+  <link rel="preload" href="https://cdn.ampproject.org/lts/v0.js" as="script">
+  <link rel="preload" href="https://cdn.ampproject.org/lts/v0.css" as="style">
+</head>
+<body></body>
+</html>
\ No newline at end of file
diff --git a/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/input.html b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/input.html
new file mode 100644
index 000000000..3e5da0cf2
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_lts_ampjs/input.html
@@ -0,0 +1,16 @@
+<!--
+{
+  "lts": true
+}
+-->
+<!doctype html>
+<html ⚡>
+<head>
+  <script async custom-element=amp-experiment src=https://ampjs.org/v0/amp-experiment-0.1.js></script>
+  <script async src="https://ampjs.org/v0.js"></script>
+  <link rel=stylesheet href=https://ampjs.org/v0.css>
+  <link href=https://fonts.googleapis.com/css?foobar rel=stylesheet type=text/css>
+  <link href=https://example.com/favicon.ico rel=icon>
+</head>
+<body></body>
+</html>
diff --git a/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/expected_output.html b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/expected_output.html
new file mode 100644
index 000000000..4a160fd16
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/expected_output.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html ⚡>
+<head>
+  <script async custom-element="amp-experiment" src="https://cdn.ampproject.org/v0/amp-experiment-0.1.js"></script>
+  <script async src="https://cdn.ampproject.org/v0.js"></script>
+  <link rel="stylesheet" href="https://cdn.ampproject.org/v0.css">
+  <link href="https://fonts.googleapis.com/css?foobar" rel="stylesheet" type="text/css">
+  <link href="https://example.com/favicon.ico" rel="icon">
+  <link rel="preload" href="https://cdn.ampproject.org/v0.js" as="script">
+  <link rel="preload" href="https://cdn.ampproject.org/v0.css" as="style">
+</head>
+<body></body>
+</html>
\ No newline at end of file
diff --git a/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/input.html b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/input.html
new file mode 100644
index 000000000..cf97424d6
--- /dev/null
+++ b/packages/optimizer/spec/transformers/valid/RewriteAmpUrls/adds_preloads_ampjs/input.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<html ⚡>
+<head>
+  <script async custom-element=amp-experiment src=https://ampjs.org/v0/amp-experiment-0.1.js></script>
+  <script async src="https://ampjs.org/v0.js"></script>
+  <link rel=stylesheet href=https://ampjs.org/v0.css>
+  <link href=https://fonts.googleapis.com/css?foobar rel=stylesheet type=text/css>
+  <link href=https://example.com/favicon.ico rel=icon>
+</head>
+<body></body>
+</html>
diff --git a/packages/runtime-version/lib/RuntimeVersion.js b/packages/runtime-version/lib/RuntimeVersion.js
index 3084e7b4b..4e514e6f1 100644
--- a/packages/runtime-version/lib/RuntimeVersion.js
+++ b/packages/runtime-version/lib/RuntimeVersion.js
@@ -15,9 +15,10 @@
  */
 'use strict';
 
+const {DEFAULT_AMP_CACHE_HOST} = require('../../optimizer/lib/AmpConstants');
+
 const log = require('@ampproject/toolbox-core').log.tag('AMP Runtime Version');
 
-const AMP_CACHE_HOST = 'https://cdn.ampproject.org';
 const RUNTIME_METADATA_PATH = '/rtv/metadata';
 const VERSION_TXT_PATH = '/version.txt';
 
@@ -96,7 +97,9 @@ class RuntimeVersion {
       releaseType = ReleaseType.lts;
     }
 
-    const host = options.ampUrlPrefix ? options.ampUrlPrefix.replace(/\/$/, '') : AMP_CACHE_HOST;
+    const host = options.ampUrlPrefix
+      ? options.ampUrlPrefix.replace(/\/$/, '')
+      : DEFAULT_AMP_CACHE_HOST;
 
     let rtv = await this.getVersionFromRuntimeMetadata_(host, releaseType);
     if (!rtv && releaseType === ReleaseType.prod) {