diff --git a/aio/content/guide/service-worker-config.md b/aio/content/guide/service-worker-config.md
index ed33174d6de3e..693c7327ef39a 100644
--- a/aio/content/guide/service-worker-config.md
+++ b/aio/content/guide/service-worker-config.md
@@ -376,6 +376,7 @@ This optional section enables you to specify a custom list of URLs that will be
 The ServiceWorker redirects navigation requests that don't match any `asset` or `data` group to the specified [index file](#index-file).
 A request is considered to be a navigation request if:
 
+*   Its [method](https://developer.mozilla.org/docs/Web/API/Request/method) is `GET`
 *   Its [mode](https://developer.mozilla.org/docs/Web/API/Request/mode) is `navigation`
 *   It accepts a `text/html` response as determined by the value of the `Accept` header
 *   Its URL matches the following criteria:
diff --git a/packages/service-worker/worker/src/app-version.ts b/packages/service-worker/worker/src/app-version.ts
index 1981c4b0068da..8cc7e8634e753 100644
--- a/packages/service-worker/worker/src/app-version.ts
+++ b/packages/service-worker/worker/src/app-version.ts
@@ -203,10 +203,10 @@ export class AppVersion implements UpdateSource {
 
   /**
    * Determine whether the request is a navigation request.
-   * Takes into account: Request mode, `Accept` header, `navigationUrls` patterns.
+   * Takes into account: Request method and mode, `Accept` header, `navigationUrls` patterns.
    */
   isNavigationRequest(req: Request): boolean {
-    if (req.mode !== 'navigate') {
+    if (req.method !== 'GET' || req.mode !== 'navigate') {
       return false;
     }
 
diff --git a/packages/service-worker/worker/test/happy_spec.ts b/packages/service-worker/worker/test/happy_spec.ts
index 9308e38a2e2e8..a31d764abeed5 100644
--- a/packages/service-worker/worker/test/happy_spec.ts
+++ b/packages/service-worker/worker/test/happy_spec.ts
@@ -1704,6 +1704,14 @@ describe('Driver', () => {
       server.assertNoOtherRequests();
     });
 
+    it('does not redirect to index on a non-GET request', async () => {
+      expect(await navRequest('/baz', {method: 'POST'})).toBeNull();
+      server.assertSawRequestFor('/baz');
+
+      expect(await navRequest('/qux', {method: 'PUT'})).toBeNull();
+      server.assertSawRequestFor('/qux');
+    });
+
     it('does not redirect to index on a non-navigation request', async () => {
       expect(await navRequest('/baz', {mode: undefined})).toBeNull();
       server.assertSawRequestFor('/baz');