ERR_CACHE_MISS: "Confirm Form Resubmission" in Chrome Explained

ERR_CACHE_MISS is shown by Chrome as "Confirm Form Resubmission" with the line "This webpage requires data that you entered earlier in order to be properly displayed. You can send this data again, but by doing so you will repeat any action this page performed earlier." The error code at the bottom is ERR_CACHE_MISS.

It is not a server failure and no network problem is involved. It means Chrome was asked to show a page that was the result of a POST request, but it does not have a cached copy and cannot silently resend the form data. Chrome refuses to repeat a POST without asking, because resending could charge a card twice or submit an order again.

If you are a visitor

1. Do not click Reload blindly on checkout or payment pages. Resubmitting can repeat a purchase, booking or post. If the page was a payment step, check your order confirmation email or account first.
2. Navigate instead of reloading. Click into the site's own link, or go back to the form page and start from there. Opening the address in a fresh tab performs a normal GET.
3. Use the Back button less aggressively. Pressing Back to a page created by a POST triggers the error because the form result is not cached.
4. Close DevTools or re-enable cache. If the Network panel is open with "Disable cache" checked, Chrome will not keep pages and may show this error on Back and Forward navigation. Untick it.
5. Update Chrome and clear cached data (Settings, Privacy and security, Delete browsing data, Cached images and files). This helps if the cache is corrupted.
6. Test an incognito window. If it works there, an extension is interfering.
7. Android only: if the error repeats on mobile Chrome, clearing app storage for the site or updating the app is a reasonable step.

When you do want to resend the data (for example, a search that used POST), click Reload on the dialog. Just be sure that repeating the action is harmless.

If you own the site

This error is a symptom of how your site handles forms and caching, so the fix is in the design.

1. Use Post/Redirect/Get

After a form submission, respond with a redirect to a result page instead of rendering the result directly from the POST. The browser then loads a normal GET page and reloads are safe:

// PHP: after saving the form
header('Location: /thank-you', true, 303);
exit;

// Express
app.post('/order', async (req, res) => {
  await saveOrder(req.body);
  res.redirect(303, '/order/confirmation');
});

Use 303 See Other for a POST that should be followed by a GET. See HTTP redirects 301 vs 302 for the differences and trace the result with the रीडायरेक्ट चेकर.

2. Do not render results straight from POST

Search forms, filters and pagination should generally use GET with query parameters so results can be bookmarked, shared and reloaded. Reserve POST for actions that change data.

3. Check cache headers on form-result pages

Headers like Cache-Control: no-store stop browsers from keeping the page, which makes Back navigation hit this error more often. That is correct for sensitive pages, but you may be sending no-store on pages that do not need it. Inspect the headers with the HTTP Header Checker.

curl -sI https://example.com/results | grep -i -E "^(cache-control|pragma|expires|vary)"

For pages with private data, no-store is a reasonable trade-off. For others, prefer Cache-Control: private, max-age=0, must-revalidate or an ETag so Back works smoothly. Which headers are right depends on your content.

4. Guard against double submission

Even with PRG, users double-click. Disable the submit button after the first click, use idempotency keys on payment endpoints, and make server handlers safe to repeat. This protects checkout flows in WooCommerce and similar systems; see WooCommerce checkout errors troubleshooting.

5. Watch for redirect loops after your change

A badly configured redirect after POST can create a loop; read ERR_TOO_MANY_REDIRECTS.

6. Sessions and cookies

If a session expired between the POST and the reload, the app may behave oddly. Inspect session cookies with the Cookie Checker.

Verify

1. Submit your form, confirm you land on a GET URL, then press Reload and Back. No dialog should appear.
2. Check the status codes with the HTTP स्टेटस चेकर and the redirect with the रीडायरेक्ट चेकर.
3. Run the वेबसाइट हेल्थ चेक to catch other problems.

अगले कदम

• Read HTTP redirects: 301 vs 302.
• Review cookie flags explained.
• See the HTTP 303 reference.
• Compare with ERR_FAILED for other generic Chrome errors.

सामान्य प्रश्न

Is ERR_CACHE_MISS dangerous?

No. It is a safety prompt. The risk is in clicking Reload on a payment or order page, which may repeat the action.

Why did it start after I opened DevTools?

With "Disable cache" ticked in the Network panel, Chrome does not keep cached pages, which triggers the prompt on Back and Forward.

Can I stop it for my users?

Yes, by redirecting after POST so the final page is a GET.

Does it mean my form data was lost?

Not necessarily. The server may have already processed it. Check before resending.

यह पेज सामान्य जानकारी है, जिसे हमारी संपादकीय टीम ने लिखा है और दस्तावेज़ीकरण बदलने पर अपडेट किया जाता है। सर्वर और प्रदाता अलग-अलग होते हैं, इसलिए बदलाव पहले सुरक्षित तरीके से जाँचें। देखें: संपादकीय नीति और अस्वीकरण.