diff --git a/.github/workflows/publish-immutable-actions.yml b/.github/workflows/publish-immutable-actions.yml
deleted file mode 100644
index 87c0207..0000000
--- a/.github/workflows/publish-immutable-actions.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-name: 'Publish Immutable Action Version'
-
-on:
-  release:
-    types: [published]
-
-jobs:
-  publish:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      id-token: write
-      packages: write
-
-    steps:
-      - name: Checking out
-        uses: actions/checkout@v4
-      - name: Publish
-        id: publish
-        uses: actions/publish-immutable-action@0.0.3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a96c76e..877a50f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,12 +1,5 @@
 # Changelog
 
-## v4.2.2
-* `url-helper.ts` now leverages well-known environment variables by @jww3 in https://github.com/actions/checkout/pull/1941
-* Expand unit test coverage for `isGhes` by @jww3 in https://github.com/actions/checkout/pull/1946
-
-## v4.2.1
-* Check out other refs/* by commit if provided, fall back to ref by @orhantoy in https://github.com/actions/checkout/pull/1924
-
 ## v4.2.0
 
 * Add Ref and Commit outputs by @lucacome in https://github.com/actions/checkout/pull/1180
diff --git a/README.md b/README.md
index 64dc025..e1ea032 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,6 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
 - [Checkout pull request HEAD commit instead of merge commit](#Checkout-pull-request-HEAD-commit-instead-of-merge-commit)
 - [Checkout pull request on closed event](#Checkout-pull-request-on-closed-event)
 - [Push a commit using the built-in token](#Push-a-commit-using-the-built-in-token)
-- [Push a commit to a PR using the built-in token](#Push-a-commit-to-a-PR-using-the-built-in-token)
 
 ## Fetch only the root files
 
@@ -212,7 +211,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     repository: my-org/my-tools
     path: my-tools
 ```
-> - If your secondary repository is private or internal you will need to add the option noted in [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
+> - If your secondary repository is private you will need to add the option noted in [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
 
 ## Checkout multiple repos (nested)
 
@@ -226,7 +225,7 @@ Please refer to the [release page](https://github.com/actions/checkout/releases/
     repository: my-org/my-tools
     path: my-tools
 ```
-> - If your secondary repository is private or internal you will need to add the option noted in [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
+> - If your secondary repository is private you will need to add the option noted in [Checkout multiple repos (private)](#Checkout-multiple-repos-private)
 
 ## Checkout multiple repos (private)
 
@@ -289,40 +288,6 @@ jobs:
 ```
 *NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
 
-## Push a commit to a PR using the built-in token
-
-In a pull request trigger, `ref` is required as GitHub Actions checks out in detached HEAD mode, meaning it doesn’t check out your branch by default.
-
-```yaml
-on: pull_request
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          ref: ${{ github.head_ref }}
-      - run: |
-          date > generated.txt
-          # Note: the following account information will not work on GHES
-          git config user.name "github-actions[bot]"
-          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
-          git add .
-          git commit -m "generated"
-          git push
-```
-
-*NOTE:* The user email is `{user.id}+{user.login}@users.noreply.github.com`. See users API: https://api.github.com/users/github-actions%5Bbot%5D
-
-# Recommended permissions
-
-When using the `checkout` action in your GitHub Actions workflow, it is recommended to set the following `GITHUB_TOKEN` permissions to ensure proper functionality, unless alternative auth is provided via the `token` or `ssh-key` inputs:
-
-```yaml
-permissions:
-  contents: read
-```
-
 # License
 
 The scripts and documentation in this project are released under the [MIT License](LICENSE)
diff --git a/__test__/ref-helper.test.ts b/__test__/ref-helper.test.ts
index 5c8d76b..d3b00b7 100644
--- a/__test__/ref-helper.test.ts
+++ b/__test__/ref-helper.test.ts
@@ -77,16 +77,6 @@ describe('ref-helper tests', () => {
     expect(checkoutInfo.startPoint).toBeFalsy()
   })
 
-  it('getCheckoutInfo refs/ without commit', async () => {
-    const checkoutInfo = await refHelper.getCheckoutInfo(
-      git,
-      'refs/non-standard-ref',
-      ''
-    )
-    expect(checkoutInfo.ref).toBe('refs/non-standard-ref')
-    expect(checkoutInfo.startPoint).toBeFalsy()
-  })
-
   it('getCheckoutInfo unqualified branch only', async () => {
     git.branchExists = jest.fn(async (remote: boolean, pattern: string) => {
       return true
diff --git a/__test__/url-helper.test.ts b/__test__/url-helper.test.ts
deleted file mode 100644
index 57cb28f..0000000
--- a/__test__/url-helper.test.ts
+++ /dev/null
@@ -1,92 +0,0 @@
-import * as urlHelper from '../src/url-helper'
-
-describe('getServerUrl tests', () => {
-  it('basics', async () => {
-    // Note that URL::toString will append a trailing / when passed just a domain name ...
-    expect(urlHelper.getServerUrl().toString()).toBe('https://github.com/')
-    expect(urlHelper.getServerUrl(' ').toString()).toBe('https://github.com/')
-    expect(urlHelper.getServerUrl('   ').toString()).toBe('https://github.com/')
-    expect(urlHelper.getServerUrl('http://contoso.com').toString()).toBe(
-      'http://contoso.com/'
-    )
-    expect(urlHelper.getServerUrl('https://contoso.com').toString()).toBe(
-      'https://contoso.com/'
-    )
-    expect(urlHelper.getServerUrl('https://contoso.com/').toString()).toBe(
-      'https://contoso.com/'
-    )
-
-    // ... but can't make that same assumption when passed an URL that includes some deeper path.
-    expect(urlHelper.getServerUrl('https://contoso.com/a/b').toString()).toBe(
-      'https://contoso.com/a/b'
-    )
-  })
-})
-
-describe('isGhes tests', () => {
-  const pristineEnv = process.env
-
-  beforeEach(() => {
-    jest.resetModules()
-    process.env = {...pristineEnv}
-  })
-
-  afterAll(() => {
-    process.env = pristineEnv
-  })
-
-  it('basics', async () => {
-    delete process.env['GITHUB_SERVER_URL']
-    expect(urlHelper.isGhes()).toBeFalsy()
-    expect(urlHelper.isGhes('https://github.com')).toBeFalsy()
-    expect(urlHelper.isGhes('https://contoso.ghe.com')).toBeFalsy()
-    expect(urlHelper.isGhes('https://test.github.localhost')).toBeFalsy()
-    expect(urlHelper.isGhes('https://src.onpremise.fabrikam.com')).toBeTruthy()
-  })
-
-  it('returns false when the GITHUB_SERVER_URL environment variable is not defined', async () => {
-    delete process.env['GITHUB_SERVER_URL']
-    expect(urlHelper.isGhes()).toBeFalsy()
-  })
-
-  it('returns false when the GITHUB_SERVER_URL environment variable is set to github.com', async () => {
-    process.env['GITHUB_SERVER_URL'] = 'https://github.com'
-    expect(urlHelper.isGhes()).toBeFalsy()
-  })
-
-  it('returns false when the GITHUB_SERVER_URL environment variable is set to a GitHub Enterprise Cloud-style URL', async () => {
-    process.env['GITHUB_SERVER_URL'] = 'https://contoso.ghe.com'
-    expect(urlHelper.isGhes()).toBeFalsy()
-  })
-
-  it('returns false when the GITHUB_SERVER_URL environment variable has a .localhost suffix', async () => {
-    process.env['GITHUB_SERVER_URL'] = 'https://mock-github.localhost'
-    expect(urlHelper.isGhes()).toBeFalsy()
-  })
-
-  it('returns true when the GITHUB_SERVER_URL environment variable is set to some other URL', async () => {
-    process.env['GITHUB_SERVER_URL'] = 'https://src.onpremise.fabrikam.com'
-    expect(urlHelper.isGhes()).toBeTruthy()
-  })
-})
-
-describe('getServerApiUrl tests', () => {
-  it('basics', async () => {
-    expect(urlHelper.getServerApiUrl()).toBe('https://api.github.com')
-    expect(urlHelper.getServerApiUrl('https://github.com')).toBe(
-      'https://api.github.com'
-    )
-    expect(urlHelper.getServerApiUrl('https://GitHub.com')).toBe(
-      'https://api.github.com'
-    )
-    expect(urlHelper.getServerApiUrl('https://contoso.ghe.com')).toBe(
-      'https://api.contoso.ghe.com'
-    )
-    expect(urlHelper.getServerApiUrl('https://fabrikam.GHE.COM')).toBe(
-      'https://api.fabrikam.ghe.com'
-    )
-    expect(
-      urlHelper.getServerApiUrl('https://src.onpremise.fabrikam.com')
-    ).toBe('https://src.onpremise.fabrikam.com/api/v3')
-  })
-})
diff --git a/dist/index.js b/dist/index.js
index b0db713..2b7dd09 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -2005,8 +2005,8 @@ function getCheckoutInfo(git, ref, commit) {
             result.ref = ref;
         }
         // refs/
-        else if (upperRef.startsWith('REFS/')) {
-            result.ref = commit ? commit : ref;
+        else if (upperRef.startsWith('REFS/') && commit) {
+            result.ref = commit;
         }
         // Unqualified ref, check for a matching branch or tag
         else {
@@ -2454,50 +2454,22 @@ function getFetchUrl(settings) {
     return `${serviceUrl.origin}/${encodedOwner}/${encodedName}`;
 }
 function getServerUrl(url) {
-    let resolvedUrl = process.env['GITHUB_SERVER_URL'] || 'https://github.com';
-    if (hasContent(url, WhitespaceMode.Trim)) {
-        resolvedUrl = url;
-    }
-    return new url_1.URL(resolvedUrl);
+    let urlValue = url && url.trim().length > 0
+        ? url
+        : process.env['GITHUB_SERVER_URL'] || 'https://github.com';
+    return new url_1.URL(urlValue);
 }
 function getServerApiUrl(url) {
-    if (hasContent(url, WhitespaceMode.Trim)) {
-        let serverUrl = getServerUrl(url);
-        if (isGhes(url)) {
-            serverUrl.pathname = 'api/v3';
-        }
-        else {
-            serverUrl.hostname = 'api.' + serverUrl.hostname;
-        }
-        return pruneSuffix(serverUrl.toString(), '/');
+    let apiUrl = 'https://api.github.com';
+    if (isGhes(url)) {
+        const serverUrl = getServerUrl(url);
+        apiUrl = new url_1.URL(`${serverUrl.origin}/api/v3`).toString();
     }
-    return process.env['GITHUB_API_URL'] || 'https://api.github.com';
+    return apiUrl;
 }
 function isGhes(url) {
-    const ghUrl = new url_1.URL(url || process.env['GITHUB_SERVER_URL'] || 'https://github.com');
-    const hostname = ghUrl.hostname.trimEnd().toUpperCase();
-    const isGitHubHost = hostname === 'GITHUB.COM';
-    const isGitHubEnterpriseCloudHost = hostname.endsWith('.GHE.COM');
-    const isLocalHost = hostname.endsWith('.LOCALHOST');
-    return !isGitHubHost && !isGitHubEnterpriseCloudHost && !isLocalHost;
-}
-function pruneSuffix(text, suffix) {
-    if (hasContent(suffix, WhitespaceMode.Preserve) && (text === null || text === void 0 ? void 0 : text.endsWith(suffix))) {
-        return text.substring(0, text.length - suffix.length);
-    }
-    return text;
-}
-var WhitespaceMode;
-(function (WhitespaceMode) {
-    WhitespaceMode[WhitespaceMode["Trim"] = 0] = "Trim";
-    WhitespaceMode[WhitespaceMode["Preserve"] = 1] = "Preserve";
-})(WhitespaceMode || (WhitespaceMode = {}));
-function hasContent(text, whitespaceMode) {
-    let refinedText = text !== null && text !== void 0 ? text : '';
-    if (whitespaceMode == WhitespaceMode.Trim) {
-        refinedText = refinedText.trim();
-    }
-    return refinedText.length > 0;
+    const ghUrl = getServerUrl(url);
+    return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
 }
 
 
diff --git a/package-lock.json b/package-lock.json
index 25753a2..a84d3bd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "checkout",
-  "version": "4.2.2",
+  "version": "4.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "checkout",
-      "version": "4.2.2",
+      "version": "4.2.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.1",
diff --git a/package.json b/package.json
index 5661d70..cdccbfc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "checkout",
-  "version": "4.2.2",
+  "version": "4.2.0",
   "description": "checkout action",
   "main": "lib/main.js",
   "scripts": {
diff --git a/src/ref-helper.ts b/src/ref-helper.ts
index cbd865f..725660a 100644
--- a/src/ref-helper.ts
+++ b/src/ref-helper.ts
@@ -46,8 +46,8 @@ export async function getCheckoutInfo(
     result.ref = ref
   }
   // refs/
-  else if (upperRef.startsWith('REFS/')) {
-    result.ref = commit ? commit : ref
+  else if (upperRef.startsWith('REFS/') && commit) {
+    result.ref = commit
   }
   // Unqualified ref, check for a matching branch or tag
   else {
diff --git a/src/url-helper.ts b/src/url-helper.ts
index 17a0842..64ecbf3 100644
--- a/src/url-helper.ts
+++ b/src/url-helper.ts
@@ -21,61 +21,26 @@ export function getFetchUrl(settings: IGitSourceSettings): string {
 }
 
 export function getServerUrl(url?: string): URL {
-  let resolvedUrl = process.env['GITHUB_SERVER_URL'] || 'https://github.com'
-  if (hasContent(url, WhitespaceMode.Trim)) {
-    resolvedUrl = url!
-  }
-
-  return new URL(resolvedUrl)
+  let urlValue =
+    url && url.trim().length > 0
+      ? url
+      : process.env['GITHUB_SERVER_URL'] || 'https://github.com'
+  return new URL(urlValue)
 }
 
 export function getServerApiUrl(url?: string): string {
-  if (hasContent(url, WhitespaceMode.Trim)) {
-    let serverUrl = getServerUrl(url)
-    if (isGhes(url)) {
-      serverUrl.pathname = 'api/v3'
-    } else {
-      serverUrl.hostname = 'api.' + serverUrl.hostname
-    }
+  let apiUrl = 'https://api.github.com'
 
-    return pruneSuffix(serverUrl.toString(), '/')
+  if (isGhes(url)) {
+    const serverUrl = getServerUrl(url)
+    apiUrl = new URL(`${serverUrl.origin}/api/v3`).toString()
   }
 
-  return process.env['GITHUB_API_URL'] || 'https://api.github.com'
+  return apiUrl
 }
 
 export function isGhes(url?: string): boolean {
-  const ghUrl = new URL(
-    url || process.env['GITHUB_SERVER_URL'] || 'https://github.com'
-  )
+  const ghUrl = getServerUrl(url)
 
-  const hostname = ghUrl.hostname.trimEnd().toUpperCase()
-  const isGitHubHost = hostname === 'GITHUB.COM'
-  const isGitHubEnterpriseCloudHost = hostname.endsWith('.GHE.COM')
-  const isLocalHost = hostname.endsWith('.LOCALHOST')
-
-  return !isGitHubHost && !isGitHubEnterpriseCloudHost && !isLocalHost
-}
-
-function pruneSuffix(text: string, suffix: string) {
-  if (hasContent(suffix, WhitespaceMode.Preserve) && text?.endsWith(suffix)) {
-    return text.substring(0, text.length - suffix.length)
-  }
-  return text
-}
-
-enum WhitespaceMode {
-  Trim,
-  Preserve
-}
-
-function hasContent(
-  text: string | undefined,
-  whitespaceMode: WhitespaceMode
-): boolean {
-  let refinedText = text ?? ''
-  if (whitespaceMode == WhitespaceMode.Trim) {
-    refinedText = refinedText.trim()
-  }
-  return refinedText.length > 0
+  return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM'
 }