diff --git a/package-lock.json b/package-lock.json
index b318837..a0c7214 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,14 +17,17 @@
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@@ -2108,61 +2101,6 @@
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@@ -14648,57 +14412,6 @@
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-          "dev": true,
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@@ -14828,6 +14541,11 @@
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       "integrity": "sha1-/oWy7HWlkDfyrf7BAP1sYBdhFS4="
     },
+    "media-typer": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "integrity": "sha512-dq+qelQ9akHpcOl/gUVRTxVIOkAJ1wR3QAvb4RsVjS8oVoFjDGTc679wJYmUmknUF5HwMLOgb5O+a3KxfWapPQ=="
+    },
     "mem": {
       "version": "8.1.1",
       "resolved": "https://registry.npmjs.org/mem/-/mem-8.1.1.tgz",
@@ -14880,6 +14598,11 @@
         }
       }
     },
+    "merge-descriptors": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
+      "integrity": "sha512-cCi6g3/Zr1iqQi6ySbseM1Xvooa98N0w31jzUYrXPX2xqObmFGHJ0tQ5u74H3mVh7wLouTseZyYIq39g8cNp1w=="
+    },
     "merge-stream": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz",
@@ -14891,6 +14614,11 @@
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       "integrity": "sha512-8q7VEgMJW4J8tcfVPy8g09NcQwZdbwFEqhe/WZkoIzjn/3TGDwtOCYtXGxA3O8tPzpczCCDgv+P2P5y00ZJOOg=="
     },
+    "methods": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
+      "integrity": "sha512-iclAHeNqNm68zFtnZ0e+1L2yUIdvzNoauKU4WBA3VvH/vPFieF7qfRlwUZU+DA9P9bPXIS90ulxoUoCH23sV2w=="
+    },
     "micro-spelling-correcter": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/micro-spelling-correcter/-/micro-spelling-correcter-1.1.1.tgz",
@@ -15082,6 +14810,30 @@
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       "optional": true
     },
+    "node-mocks-http": {
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/node-mocks-http/-/node-mocks-http-1.12.1.tgz",
+      "integrity": "sha512-jrA7Sn3qI6GsHgWtUW3gMj0vO6Yz0nJjzg3jRZYjcfj4tzi8oWPauDK1qHVJoAxTbwuDHF1JiM9GISZ/ocI/ig==",
+      "requires": {
+        "accepts": "^1.3.7",
+        "content-disposition": "^0.5.3",
+        "depd": "^1.1.0",
+        "fresh": "^0.5.2",
+        "merge-descriptors": "^1.0.1",
+        "methods": "^1.1.2",
+        "mime": "^1.3.4",
+        "parseurl": "^1.3.3",
+        "range-parser": "^1.2.0",
+        "type-is": "^1.6.18"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "1.1.2",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
+          "integrity": "sha512-7emPTl6Dpo6JRXOXjLRxck+FlLRX5847cLKEn00PLAgc3g2hTZZgr+e4c2v6QpSmLeFP3n5yUo7ft6avBK/5jQ=="
+        }
+      }
+    },
     "node-releases": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.6.tgz",
@@ -15147,6 +14899,17 @@
         "string.prototype.padend": "^3.0.0"
       },
       "dependencies": {
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
         "cross-spawn": {
           "version": "6.0.5",
           "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
@@ -15367,57 +15130,6 @@
         "log-symbols": "^4.1.0",
         "strip-ansi": "^6.0.0",
         "wcwidth": "^1.0.1"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "4.3.0",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^2.0.1"
-          }
-        },
-        "chalk": {
-          "version": "4.1.2",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
-          "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^4.1.0",
-            "supports-color": "^7.1.0"
-          }
-        },
-        "color-convert": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
-          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-          "dev": true,
-          "requires": {
-            "color-name": "~1.1.4"
-          }
-        },
-        "color-name": {
-          "version": "1.1.4",
-          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
-          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
-          "dev": true
-        },
-        "has-flag": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
-          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "7.2.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
-          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^4.0.0"
-          }
-        }
       }
     },
     "os-tmpdir": {
@@ -15877,6 +15589,15 @@
       "resolved": "https://registry.npmjs.org/proto-list/-/proto-list-1.2.4.tgz",
       "integrity": "sha512-vtK/94akxsTMhe0/cbfpR+syPuszcuwhqVjJq26CuNDgFGj682oRBXOP5MJpv2r7JtE8MsiepGIqvvOTBwn2vA=="
     },
+    "proxy-addr": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
+      "integrity": "sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==",
+      "requires": {
+        "forwarded": "0.2.0",
+        "ipaddr.js": "1.9.1"
+      }
+    },
     "prr": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/prr/-/prr-1.0.1.tgz",
@@ -16435,6 +16156,11 @@
         "tslib": "^1.9.0"
       }
     },
+    "safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+    },
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@@ -16878,14 +16604,6 @@
       "dev": true,
       "requires": {
         "safe-buffer": "~5.2.0"
-      },
-      "dependencies": {
-        "safe-buffer": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
-          "dev": true
-        }
       }
     },
     "string-width": {
@@ -17239,6 +16957,15 @@
       "integrity": "sha512-t0rzBq87m3fVcduHDUFhKmyyX+9eo6WQjZvf51Ea/M0Q7+T374Jp1aUiyUl0GKxp8M/OETVHSDvmkyPgvX+X2w==",
       "dev": true
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -17332,46 +17059,6 @@
         "xdg-basedir": "^4.0.0"
       },
       "dependencies": {
-        "ansi-styles": {
-          "version": "4.3.0",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
-          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^2.0.1"
-          }
-        },
-        "chalk": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
-          "integrity": "sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^4.1.0",
-            "supports-color": "^7.1.0"
-          }
-        },
-        "color-convert": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
-          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
-          "dev": true,
-          "requires": {
-            "color-name": "~1.1.4"
-          }
-        },
-        "color-name": {
-          "version": "1.1.4",
-          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
-          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
-          "dev": true
-        },
-        "has-flag": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
-          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
-          "dev": true
-        },
         "semver": {
           "version": "7.3.5",
           "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.5.tgz",
@@ -17380,15 +17067,6 @@
           "requires": {
             "lru-cache": "^6.0.0"
           }
-        },
-        "supports-color": {
-          "version": "7.2.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
-          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
-          "dev": true,
-          "requires": {
-            "has-flag": "^4.0.0"
-          }
         }
       }
     },
diff --git a/package.json b/package.json
index c336904..422e23d 100644
--- a/package.json
+++ b/package.json
@@ -26,23 +26,26 @@
     "@11ty/eleventy-cache-assets": "^2.3.0",
     "@imgix/js-core": "^3.1.3",
     "@justinribeiro/lite-youtube": "^0.9.1",
+    "@mdn/browser-compat-data": "5.2.x",
     "@swc/html": "0.0.18",
     "async-transforms": "^1.0.9",
     "browser-media-mime-type": "^1.0.0",
+    "chalk": "4.1.2",
     "common-tags": "^1.8.0",
     "csso": "5.0.5",
+    "express": "4.18.2",
     "fast-glob": "3.2.12",
     "js-yaml": "4.1.0",
     "lit-element": "^2.5.1",
     "lodash.get": "4.4.2",
     "lodash.set": "4.3.2",
     "markdown-it": "^12.3.2",
+    "node-mocks-http": "1.12.1",
     "nunjucks": "3.2.3",
     "piscina": "^3.2.0",
     "purgecss": "5.0.0",
     "querystring": "^0.2.1",
-    "striptags": "^3.1.1",
-    "@mdn/browser-compat-data": "5.2.x"
+    "striptags": "^3.1.1"
   },
   "peerDependencies": {
     "@mdn/browser-compat-data": "5.2.x"
diff --git a/types/utils/url-crawl/ScanError.d.ts b/types/utils/url-crawl/ScanError.d.ts
new file mode 100644
index 0000000..26569a2
--- /dev/null
+++ b/types/utils/url-crawl/ScanError.d.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type ScanError = {
+  path: string;
+  tag: string;
+  statusCode: number;
+  summary: string;
+  parent: string | null;
+};
diff --git a/types/utils/url-crawl/UrlCrawlOptions.d.ts b/types/utils/url-crawl/UrlCrawlOptions.d.ts
new file mode 100644
index 0000000..6c3bf69
--- /dev/null
+++ b/types/utils/url-crawl/UrlCrawlOptions.d.ts
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export type UrlCrawlOptions = {
+  shouldNormalizeTrailingSlash?: boolean;
+  shouldDisableDuplicateUrls?: boolean;
+  onErrorOutput?: (error: ScanError) => string;
+  handlers?: import('express').RequestHandler[];
+  shouldDetectSuperstatic?: boolean;
+};
diff --git a/types/utils/url-crawl/index.d.ts b/types/utils/url-crawl/index.d.ts
new file mode 100644
index 0000000..1e46071
--- /dev/null
+++ b/types/utils/url-crawl/index.d.ts
@@ -0,0 +1,18 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+export * from './ScanError';
+export * from './UrlCrawlOptions';
diff --git a/utils/url-crawl/UrlCrawl.js b/utils/url-crawl/UrlCrawl.js
new file mode 100644
index 0000000..abe1bb7
--- /dev/null
+++ b/utils/url-crawl/UrlCrawl.js
@@ -0,0 +1,380 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const chalk = require('chalk');
+const {createMocks} = require('node-mocks-http');
+const EventEmitter = require('events');
+const response = require('express/lib/response');
+const fs = require('fs');
+const UrlCrawlResult = require('./UrlCrawlResult');
+
+// matches <body>...</body>
+const HTML_BODY_REGEX = /<body(?:\s+[^>]+)?>(.*)<\/body>/is;
+
+// matches <a ...> or <area ...>
+const HTML_HREF_ELEMENT_REGEX = /<(a|area)\s.+?>.+?(?=>)\/?>/gi;
+
+// matches href="..."/'...' (backslash escape aware) or href=...
+const HTML_HREF_ATTRIBUTE_REGEX = /href=("(?:\\["\\]|[^"\\]+)*"|'(?:\\['\\]|[^'\\]+)*'|[^\s>]+)/gi;
+
+module.exports = class UrlCrawl {
+  /**
+   * @param {import('types/utils/url-crawl').UrlCrawlOptions?} options
+   */
+  constructor(options) {
+    this.shouldNormalizeTrailingSlash =
+      options?.shouldNormalizeTrailingSlash ?? true;
+    this.shouldDisableDuplicateUrls =
+      options?.shouldDisableDuplicateUrls ?? true;
+    this.onErrorOutput =
+      options?.onErrorOutput ?? this._defaultErrorOutputHandler;
+    this.handlers = options?.handlers ?? [];
+
+    if (options?.shouldDetectSuperstatic !== false) {
+      // disabled eslint-rule because superstatic is read from the executing package
+      let superstaticModulePath = null;
+      try {
+        // eslint-disable-next-line node/no-missing-require
+        superstaticModulePath = require.resolve('superstatic', {
+          paths: [process.cwd()],
+        });
+      } catch (e) {
+        if (
+          e instanceof Error &&
+          /** @type {Error & {
+            code: string
+          }} */ (e)
+            .code !== 'MODULE_NOT_FOUND'
+        ) {
+          throw e;
+        }
+      }
+
+      if (superstaticModulePath !== null) {
+        this.debug(
+          'Detected firebase (can be disabled with `shouldDetectSuperstatic: false`)'
+        );
+
+        const superstatic = require(superstaticModulePath);
+        const firebaseConfigPath = `${process.cwd()}/firebase.json`;
+        let config = {};
+        if (fs.existsSync(firebaseConfigPath)) {
+          config =
+            JSON.parse(fs.readFileSync(firebaseConfigPath, 'utf8'))?.hosting ??
+            {};
+        } else {
+          this.debug('No firebase.json found');
+        }
+
+        this.handlers.unshift(
+          superstatic({
+            config,
+          })
+        );
+      }
+    }
+  }
+
+  /**
+   * If no error output handler is provided, this one is used
+   *
+   * @param {ScanError} error
+   * @returns {string}
+   */
+  _defaultErrorOutputHandler(error) {
+    return `${chalk[error.statusCode === 200 ? 'green' : 'red'].bold(
+      `${error.statusCode} ${error.summary}`
+    )} ${error.tag}[href="${chalk.red(error.path)}"] @ ${error.parent}`;
+  }
+
+  /**
+   * Prints debug message to the console
+   *
+   * @param {any} content The content to print
+   */
+  debug(...content) {
+    if (process.env.DEBUG) {
+      console.debug('DEBUG', ...content);
+    }
+  }
+
+  /**
+   * Simulates a network request to the express webserver.
+   *
+   * @param {string} urlPath The URL path to simulate
+   * @returns {Promise<import('express').Response>}
+   */
+  simulateExpressPath(urlPath) {
+    const {req, res} = createMocks(
+      {
+        method: 'GET',
+        url: urlPath,
+      },
+      {
+        eventEmitter: EventEmitter,
+      }
+    );
+
+    // as data is written to the stream, store it in body to be used by the crawler
+    let body = '';
+    Object.assign(res, response, {
+      req,
+      write(data) {
+        body += data.toString();
+      },
+    });
+
+    return new Promise(resolve => {
+      // the stream has been signaled there's no more data, time to give all the collected data to
+      // the crawler
+      res.on('end', () => {
+        res.content = body;
+        resolve(res);
+      });
+
+      /**
+       * Call the next in line handler
+       *
+       * @param {number} handlerIndex The index of the handler to call
+       */
+      const callNextHandler = (handlerIndex = 0) => {
+        if (this.handlers === undefined) {
+          throw new Error('Handlers not initialized');
+        }
+
+        const handler = this.handlers[handlerIndex];
+        if (!handler) {
+          throw new Error('No more handlers to call');
+        }
+
+        handler(
+          /** @type {import('express').Request} */ (req),
+          /** @type {import('express').Response} */ (res),
+          () => {
+            callNextHandler(handlerIndex + 1);
+          }
+        );
+      };
+
+      callNextHandler();
+    });
+  }
+
+  /**
+   * @typedef {{
+   *   path: string,
+   *   tag: string,
+   *   statusCode: number,
+   *   summary: string,
+   *   parent: ?string,
+   * }} ScanError
+   */
+
+  /**
+   * @param {UrlCrawlResult} result
+   * @param {string} cachePath
+   * @param {ScanError} error
+   */
+  handleError(result, cachePath, error) {
+    if (this.onErrorOutput) {
+      console.log(this.onErrorOutput(error));
+    }
+
+    result.errors.push(error);
+    result.scannedUrls[cachePath] = error;
+  }
+
+  /**
+   * Recursively loads a path's content and scans it for URLs
+   *
+   * @param {UrlCrawlResult} result
+   * @param {string} urlPath
+   * @param {string} tag
+   * @param {?string} parent
+   * @param {boolean} shouldSilentlyFail
+   *
+   * @returns {Promise<number>}
+   */
+  async scanPath(
+    result,
+    urlPath,
+    tag,
+    parent = null,
+    shouldSilentlyFail = false
+  ) {
+    // instead of checking a URL everytime it is reused, we check it once and cache the result
+    let cachePath = urlPath;
+    if (this.shouldNormalizeTrailingSlash && !urlPath.endsWith('/')) {
+      cachePath += '/';
+    }
+
+    const cachedResult = result.scannedUrls[cachePath];
+    if (this.shouldDisableDuplicateUrls && cachedResult) {
+      return 200;
+    }
+
+    result.incrementScanCount();
+
+    if (cachedResult !== undefined) {
+      if (cachedResult !== 'OK' && !shouldSilentlyFail) {
+        this.handleError(result, cachePath, {
+          ...cachedResult,
+          parent,
+          tag,
+        });
+      }
+
+      return cachedResult.statusCode;
+    }
+
+    // run request simulation on the path
+    const res = await this.simulateExpressPath(urlPath);
+    if (res.statusCode === 404) {
+      if (!shouldSilentlyFail) {
+        this.handleError(result, cachePath, {
+          path: urlPath,
+          statusCode: res.statusCode,
+          tag,
+          summary: 'Not Found',
+          parent,
+        });
+      }
+
+      return res.statusCode;
+    } else if (res.statusCode === 301 || res.statusCode === 302) {
+      const location = /** @type {string} */ (res.getHeader('Location'));
+      // external redirect, ignore
+      if (location.startsWith('http://') || location.startsWith('https://')) {
+        return 200;
+      }
+
+      const redirectResult = await this.scanPath(
+        result,
+        location,
+        tag,
+        parent,
+        true
+      );
+
+      if (redirectResult !== 200 && !shouldSilentlyFail) {
+        this.handleError(result, cachePath, {
+          path: urlPath,
+          tag,
+          statusCode: redirectResult,
+          summary: 'Redirected',
+          parent,
+        });
+      }
+
+      return redirectResult;
+    }
+
+    // if the content is not HTML, we don't need to scan it
+    const contentType = /** @type {string} */ (res.getHeader('Content-Type'));
+    if (contentType === null || !contentType.startsWith('text/html')) {
+      return 200;
+    }
+
+    // will contain the ... in <body>...</body>
+    const bodyContent = HTML_BODY_REGEX.exec(res.content)?.[1];
+    if (bodyContent === undefined) {
+      this.handleError(result, cachePath, {
+        path: urlPath,
+        tag,
+        statusCode: res.statusCode,
+        summary: 'No <body>',
+        parent,
+      });
+
+      return res.statusCode;
+    }
+
+    result.scannedUrls[cachePath] = 'OK';
+    await this.detectUrls(bodyContent, urlPath, async (url, elTag) => {
+      if (url.hostname !== 'internal') {
+        return;
+      }
+
+      await this.scanPath(result, url.pathname, elTag, urlPath);
+    });
+
+    return 200;
+  }
+
+  /**
+   * @returns {Promise<UrlCrawlResult>}
+   */
+  async go() {
+    const result = new UrlCrawlResult();
+
+    // initiate the scan
+    await this.scanPath(result, '/', 'root');
+
+    return result;
+  }
+
+  /**
+   * Detect URLs in a HTML string and call onUrl for each one
+   *
+   * @param {string} html The HTML to search for URLs
+   * @param {string} pageUrl The URL of the page that contains the HTML
+   * @param {(url: URL, elTag: string) => void} onUrl A callback that is called for each URL found
+   */
+  async detectUrls(html, pageUrl, onUrl) {
+    HTML_HREF_ELEMENT_REGEX.lastIndex = 0;
+    // find all <a ...> or <area ...> matches
+    // eslint-disable-next-line no-constant-condition
+    while (true) {
+      const match = HTML_HREF_ELEMENT_REGEX.exec(html);
+
+      if (match === null) {
+        break;
+      }
+
+      // find the href attribute
+      HTML_HREF_ATTRIBUTE_REGEX.lastIndex = 0;
+      const hrefMatch = HTML_HREF_ATTRIBUTE_REGEX.exec(match[0]);
+      if (hrefMatch === null) {
+        continue;
+      }
+
+      let url = hrefMatch[1];
+      // to cheaply support quote attributes, we can convert it using JSON.parse
+      if (url.charAt(0) === '"') {
+        try {
+          url = JSON.parse(
+            url
+              .replace(/\t/g, '\\t')
+              .replace(/\r/g, '\\r')
+              .replace(/\n/g, '\\n')
+              .replace(/\f/g, '\\f')
+          );
+        } catch (e) {
+          this.debug('Failed to parse attribute value', url, e);
+
+          continue;
+        }
+      } else if (url.charAt(0) === "'") {
+        // TODO, future improvement could be to support escaped quotes if required
+        url = url.slice(1, -1);
+      }
+
+      const parsedUrl = new URL(url, `http://internal${pageUrl ?? ''}`);
+
+      await onUrl(parsedUrl, match[1]);
+    }
+  }
+};
diff --git a/utils/url-crawl/UrlCrawlResult.js b/utils/url-crawl/UrlCrawlResult.js
new file mode 100644
index 0000000..dc8f2a9
--- /dev/null
+++ b/utils/url-crawl/UrlCrawlResult.js
@@ -0,0 +1,100 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const chalk = require('chalk');
+
+module.exports = class UrlCrawlResult {
+  constructor() {
+    this.scannedUrls = {};
+    this.scanCount = 0;
+    /** @type {import('types/utils/url-crawl').ScanError[]} */
+    this.errors = [];
+
+    this.startTime = Date.now();
+  }
+
+  get errorCount() {
+    return this.errors.length;
+  }
+
+  incrementScanCount() {
+    this.scanCount++;
+  }
+
+  getScanDuration() {
+    return `${(Date.now() - this.startTime) / 1000}s`;
+  }
+
+  summaryToConsole() {
+    const errorCategories = {};
+    for (const error of this.errors) {
+      const key = `${error.statusCode} ${error.summary}`;
+      if (errorCategories[key] === undefined) {
+        errorCategories[key] = [];
+      }
+
+      errorCategories[key].push(error);
+    }
+
+    /**
+     * @param {number} number
+     * @returns {string}
+     */
+    function formatNumber(number) {
+      return number.toLocaleString('en-GB');
+    }
+
+    const errorCount = this.errorCount;
+    const summary = [
+      '',
+      '=== Summary ===',
+      `Scanned ${formatNumber(
+        this.scanCount
+      )} URLs in ${this.getScanDuration()}`,
+      '',
+      'Error Summary',
+      Object.entries(errorCategories)
+        .map(
+          ([key, errors]) =>
+            `  ${chalk[errors[0].statusCode === 200 ? 'green' : 'red'].bold(
+              key
+            )}: ${formatNumber(errors.length)}`
+        )
+        .join('\n'),
+      '',
+      'Totals',
+      `  Errors: ${formatNumber(errorCount)}`,
+      `  Pass: ${formatNumber(this.scanCount - errorCount)}`,
+      '',
+    ];
+
+    console.log(summary.join('\n'));
+  }
+
+  toObject() {
+    return {
+      scanDuration: this.getScanDuration(),
+      scanCount: this.scanCount,
+      errorCount: this.errorCount,
+      scannedUrls: this.scannedUrls,
+      errors: this.errors,
+    };
+  }
+
+  toJson(shouldPrettyPrint = false) {
+    return JSON.stringify(this.toObject(), null, shouldPrettyPrint ? 2 : 0);
+  }
+};
diff --git a/utils/url-crawl/index.js b/utils/url-crawl/index.js
new file mode 100644
index 0000000..62e09f1
--- /dev/null
+++ b/utils/url-crawl/index.js
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2023 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const UrlCrawl = require('./UrlCrawl');
+const UrlCrawlResult = require('./UrlCrawlResult');
+
+module.exports = {UrlCrawl, UrlCrawlResult};