ERR_CACHE_MISS 🧭 Browser

ERR_CACHE_MISS: Confirm Form Resubmission

You pressed Back/Refresh on a page that was the result of a form POST, so the browser asks before sending the form again.

Seen on: Chrome

Meaning

Browsers don’t cache POST responses. Developers fix it with the Post/Redirect/Get pattern: after handling a POST, redirect (303) to a normal GET page.

Common causes

  • Refreshing or going back to a page produced by a POST form
  • Site doesn’t redirect after processing forms
  • Cache-Control: no-store on the page

⚡ Quick fix

  1. Visitors: navigate to the page again instead of refreshing
  2. Developers: redirect after successful POST (303 See Other)
  3. Avoid no-store on pages users navigate back to

Detailed fix by platform

PHP

  1. php
    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    save($_POST);
    header('Location: /thank-you', true, 303);
    exit;
}

How to diagnose

  1. Flow — Was the page a POST result?
  2. Server — Redirects after POST?

🔧 Still not fixed?

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