From 776ee11962bc8278008af0047048778c49354e3e Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Fri, 16 Oct 2026 02:44:57 +0000
Subject: [PATCH] feat(ui): add a first-visit welcome and a crawlable what-is
 page
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

A first visit landed on a screen of controls for a machine that is not connected
yet, with nothing saying what the app is or what it needs. The static intro in
index.html says it, but main.tsx removes it the moment the app mounts.

Two pieces, because the app has no URL of its own to give a crawler:

- A welcome sheet that opens on its own once, for a browser with no stored walks
  and no record of having seen it. It is short on purpose: what it does, what it
  needs, and the safety rule. A "What is Belt Control?" button in the footer
  reopens it from any screen.
- /what-is-belt-control, a written page like the other four in public/, which the
  sheet's "Read more" links to. It carries the long version, is in the sitemap,
  is excluded from the SPA rewrite and given the revalidate header, and is linked
  from the static intro and the footer of every written page — the five edits
  docs/deploying.md lists for a new page.

The seen flag is its own storage key, so Recovery's dump and clear pick it up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XyxvATqpdrFdrGbkCMayk6
---
 apps/web/index.html                           |   2 +
 .../public/compatible-treadmills/index.html   |   1 +
 apps/web/public/sitemap.xml                   |   6 +
 apps/web/public/troubleshooting/index.html    |   1 +
 .../walkingpad-bluetooth-protocol/index.html  |   1 +
 .../walkingpad-without-the-app/index.html     |   1 +
 .../public/what-is-belt-control/index.html    | 131 ++++++++++++++++++
 apps/web/src/app.tsx                          |   3 +
 apps/web/src/components/Disclaimer.tsx        |   5 +
 apps/web/src/components/WelcomeSheet.tsx      | 112 +++++++++++++++
 apps/web/src/lib/analytics.ts                 |   4 +
 apps/web/src/lib/storage.ts                   |   1 +
 apps/web/src/styles/app.css                   |   5 +
 docs/deploying.md                             |   7 +-
 vercel.json                                   |   4 +-
 15 files changed, 279 insertions(+), 5 deletions(-)
 create mode 100644 apps/web/public/what-is-belt-control/index.html
 create mode 100644 apps/web/src/components/WelcomeSheet.tsx

diff --git a/apps/web/index.html b/apps/web/index.html
index 44ae8c5..5081721 100644
--- a/apps/web/index.html
+++ b/apps/web/index.html
@@ -128,6 +128,8 @@ <h2>Which treadmills work</h2>
 
   <h2>More</h2>
   <ul>
+    <li><a href="/what-is-belt-control">What is Belt Control?</a> — what it does, who it's
+      for, and what you need</li>
     <li><a href="/compatible-treadmills">Will it work with my treadmill?</a> — every model,
       and what each one can show you</li>
     <li><a href="/walkingpad-without-the-app">Using a WalkingPad without the KS+Fit app</a></li>
diff --git a/apps/web/public/compatible-treadmills/index.html b/apps/web/public/compatible-treadmills/index.html
index e63da41..1b41c0d 100644
--- a/apps/web/public/compatible-treadmills/index.html
+++ b/apps/web/public/compatible-treadmills/index.html
@@ -184,6 +184,7 @@ <h2>If your pad isn't listed</h2>
 <footer>
   <ul>
     <li><a href="/">The app</a></li>
+    <li><a href="/what-is-belt-control">What is Belt Control?</a></li>
     <li><a href="/walkingpad-without-the-app">Without the KS+Fit app</a></li>
     <li><a href="/troubleshooting">Troubleshooting</a></li>
     <li><a href="/walkingpad-bluetooth-protocol">How it works, technically</a></li>
diff --git a/apps/web/public/sitemap.xml b/apps/web/public/sitemap.xml
index 976817e..8d1fae5 100644
--- a/apps/web/public/sitemap.xml
+++ b/apps/web/public/sitemap.xml
@@ -13,6 +13,12 @@
     <changefreq>monthly</changefreq>
     <priority>1.0</priority>
   </url>
+  <url>
+    <loc>https://beltcontrol.com/what-is-belt-control</loc>
+    <lastmod>__LASTMOD__</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.8</priority>
+  </url>
   <url>
     <loc>https://beltcontrol.com/compatible-treadmills</loc>
     <lastmod>__LASTMOD__</lastmod>
diff --git a/apps/web/public/troubleshooting/index.html b/apps/web/public/troubleshooting/index.html
index fd85810..8655436 100644
--- a/apps/web/public/troubleshooting/index.html
+++ b/apps/web/public/troubleshooting/index.html
@@ -157,6 +157,7 @@ <h2>It worked yesterday. Why do I have to pick my pad again?</h2>
 <footer>
   <ul>
     <li><a href="/">The app</a></li>
+    <li><a href="/what-is-belt-control">What is Belt Control?</a></li>
     <li><a href="/compatible-treadmills">Compatible treadmills</a></li>
     <li><a href="/walkingpad-without-the-app">Without the KS+Fit app</a></li>
     <li><a href="/walkingpad-bluetooth-protocol">How it works, technically</a></li>
diff --git a/apps/web/public/walkingpad-bluetooth-protocol/index.html b/apps/web/public/walkingpad-bluetooth-protocol/index.html
index 8630a3e..f720d4a 100644
--- a/apps/web/public/walkingpad-bluetooth-protocol/index.html
+++ b/apps/web/public/walkingpad-bluetooth-protocol/index.html
@@ -369,6 +369,7 @@ <h2>The full reference</h2>
 <footer>
   <ul>
     <li><a href="/">The app</a></li>
+    <li><a href="/what-is-belt-control">What is Belt Control?</a></li>
     <li><a href="/compatible-treadmills">Compatible treadmills</a></li>
     <li><a href="/walkingpad-without-the-app">Without the KS+Fit app</a></li>
     <li><a href="/troubleshooting">Troubleshooting</a></li>
diff --git a/apps/web/public/walkingpad-without-the-app/index.html b/apps/web/public/walkingpad-without-the-app/index.html
index 715cb50..bb1c993 100644
--- a/apps/web/public/walkingpad-without-the-app/index.html
+++ b/apps/web/public/walkingpad-without-the-app/index.html
@@ -160,6 +160,7 @@ <h2>Does it need an internet connection?</h2>
 <footer>
   <ul>
     <li><a href="/">The app</a></li>
+    <li><a href="/what-is-belt-control">What is Belt Control?</a></li>
     <li><a href="/compatible-treadmills">Compatible treadmills</a></li>
     <li><a href="/troubleshooting">Troubleshooting</a></li>
     <li><a href="/walkingpad-bluetooth-protocol">How it works, technically</a></li>
diff --git a/apps/web/public/what-is-belt-control/index.html b/apps/web/public/what-is-belt-control/index.html
new file mode 100644
index 0000000..c8ec6bb
--- /dev/null
+++ b/apps/web/public/what-is-belt-control/index.html
@@ -0,0 +1,131 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+<title>What Is Belt Control? A Browser Remote for Your Walking Pad</title>
+<meta name="description" content="Belt Control is a free web app that starts, stops and sets the speed of a KingSmith or WalkingPad treadmill over Bluetooth, and keeps a private record of every walk. Here's what it does and who it's for.">
+<link rel="canonical" href="https://beltcontrol.com/what-is-belt-control">
+<meta name="robots" content="index, follow, max-image-preview:large">
+<meta property="og:type" content="article">
+<meta property="og:site_name" content="Belt Control">
+<meta property="og:url" content="https://beltcontrol.com/what-is-belt-control">
+<meta property="og:title" content="What is Belt Control?">
+<meta property="og:description" content="A free web app that controls a KingSmith or WalkingPad treadmill over Bluetooth and keeps a private record of every walk.">
+<meta property="og:image" content="https://beltcontrol.com/og.png">
+<meta name="twitter:card" content="summary_large_image">
+<link rel="icon" href="/icon.svg" type="image/svg+xml">
+<link rel="stylesheet" href="/content.css">
+<meta name="theme-color" content="#f6f7f9" media="(prefers-color-scheme: light)">
+<meta name="theme-color" content="#0b0e11" media="(prefers-color-scheme: dark)">
+</head>
+<body>
+<div class="page">
+
+<header class="masthead">
+  <a class="brand" href="/">Belt Control <span>— treadmill control in the browser</span></a>
+</header>
+
+<main>
+<h1>What is Belt Control?</h1>
+<p class="lede">
+  Belt Control is a remote control for a walking pad that runs in a browser tab. It
+  connects to a KingSmith or WalkingPad treadmill over Bluetooth, lets you start it, stop
+  it and set the speed, and keeps a record of every walk. It's free, and you don't need an
+  account, the phone app or anything else installed.
+</p>
+
+<h2>What it's for</h2>
+<p>
+  Walking pads are mostly used under a standing desk: you walk slowly for an hour while you
+  work. The remote that comes in the box can start and stop the belt, but it doesn't
+  remember anything. The manufacturer's phone app does, but it means reaching for your
+  phone, signing in, and keeping that phone next to the treadmill.
+</p>
+<p>
+  Belt Control puts the controls in the place you're already looking, the computer on the
+  desk. It's built for that:
+</p>
+<ul>
+  <li><strong>Controls at a glance.</strong> Start, stop, pause on pads that support it, and
+    one-tap speed presets for the two or three speeds you actually walk at.</li>
+  <li><strong>Live numbers as you walk.</strong> Time, distance, steps and calories, as far
+    as your treadmill reports them. Numbers a pad sends but can't be trusted are shown as
+    such and left out of your totals.</li>
+  <li><strong>Every walk recorded automatically.</strong> Daily totals, a goal you set, a
+    30-day history and a streak, without pressing record.</li>
+  <li><strong>Your data stays yours.</strong> Your walks are saved in your own browser and
+    never uploaded. You can export them as a backup or as a spreadsheet whenever you
+    like.</li>
+</ul>
+
+<h2>How it works</h2>
+<p>
+  Chrome, Edge, Opera and Samsung Internet can talk to Bluetooth devices directly from a
+  web page. Belt Control uses that to talk to the treadmill the same way the phone app does.
+  When you press <strong>Connect</strong>, your browser shows a list of nearby treadmills.
+  Pick yours, and Belt Control asks it what it can do and works from there, so it doesn't
+  need to know your model in advance.
+</p>
+<p>
+  The connection goes straight from your browser to the treadmill over the radio. The
+  website only delivers the page itself. It never sees your walks or anything about your
+  treadmill. Once it has loaded, it works offline too.
+</p>
+
+<h2>What you need</h2>
+<ul>
+  <li><strong>A KingSmith or WalkingPad treadmill</strong>, or a pad that speaks the same
+    language. Most models from the last several years work — see
+    <a href="/compatible-treadmills">the full list</a>.</li>
+  <li><strong>Chrome, Edge, Opera or Samsung Internet</strong>, on a computer or an Android
+    device. Firefox and Safari can't connect to Bluetooth devices, and on an iPhone or iPad
+    every browser is Safari underneath.</li>
+  <li><strong>The phone app closed.</strong> These treadmills only talk to one device at a
+    time.</li>
+</ul>
+
+<div class="cta">
+  <p><strong>Try it with your treadmill.</strong> Switch the pad on, open the app and press
+  Connect. Nothing to install and no account to create.</p>
+  <p><a class="btn" href="/">Open Belt Control</a></p>
+</div>
+
+<h2>Is it safe?</h2>
+<p>
+  Belt Control runs a motorised treadmill, so treat it like the remote, not like a safety
+  device. Only start the belt when you can see it, and use the treadmill's own controls or
+  safety key to stop in a hurry: a Bluetooth connection can drop while the belt keeps
+  running. While the belt is moving, a Stop button stays on screen everywhere in the app and
+  the Esc key stops it.
+</p>
+
+<h2>Who makes it?</h2>
+<p>
+  Belt Control is an independent, open-source project. It isn't made by KingSmith and isn't
+  affiliated with them. The <a href="https://github.com/morsela/beltcontrol">source code is
+  on GitHub</a>, and the app has a <strong>Send feedback</strong> link at the bottom of every
+  screen.
+</p>
+
+</main>
+
+<footer>
+  <ul>
+    <li><a href="/">The app</a></li>
+    <li><a href="/compatible-treadmills">Compatible treadmills</a></li>
+    <li><a href="/walkingpad-without-the-app">Without the KS+Fit app</a></li>
+    <li><a href="/troubleshooting">Troubleshooting</a></li>
+    <li><a href="/walkingpad-bluetooth-protocol">How it works, technically</a></li>
+    <li><a href="https://github.com/morsela/beltcontrol">GitHub</a></li>
+  </ul>
+  <p class="fine">
+    Belt Control is an independent project, not affiliated with, endorsed by, or sponsored
+    by Beijing KingSmith Technology Co., Ltd. WalkingPad® and KingSmith® are trademarks of
+    that company, used here only to identify compatible treadmills.
+  </p>
+</footer>
+
+</div>
+</body>
+</html>
diff --git a/apps/web/src/app.tsx b/apps/web/src/app.tsx
index 7ed414a..689b134 100644
--- a/apps/web/src/app.tsx
+++ b/apps/web/src/app.tsx
@@ -11,6 +11,7 @@ import { AmbientView } from './components/AmbientView.js';
 import { DesktopOnlyNotice } from './components/DesktopOnlyNotice.js';
 import { Recovery } from './components/Recovery.js';
 import { Disclaimer } from './components/Disclaimer.js';
+import { WelcomeSheet } from './components/WelcomeSheet.js';
 import { beltMayBeMoving, connected } from './state/connection.js';
 import { isDesktop } from './lib/viewport.js';
 import { trackEvent } from './lib/analytics.js';
@@ -106,6 +107,7 @@ export function App() {
             {r !== 'legal' && <Disclaimer />}
           </div>
         </main>
+        <WelcomeSheet />
         <Analytics />
       </>
     );
@@ -124,6 +126,7 @@ export function App() {
 
       {showStop && <StopBar />}
       <TabBar route={r} />
+      <WelcomeSheet />
       <Analytics />
     </>
   );
diff --git a/apps/web/src/components/Disclaimer.tsx b/apps/web/src/components/Disclaimer.tsx
index bbaedaf..d24f4b8 100644
--- a/apps/web/src/components/Disclaimer.tsx
+++ b/apps/web/src/components/Disclaimer.tsx
@@ -1,4 +1,5 @@
 import { FeedbackLink } from './FeedbackSheet.js';
+import { WelcomeLink } from './WelcomeSheet.js';
 
 /**
  * Sits at the bottom of every screen, not behind an About tab.
@@ -25,6 +26,9 @@ import { FeedbackLink } from './FeedbackSheet.js';
  * anchor because it opens a dialog rather than a page — there is no hash for it to
  * put in front of the router. Reports about the connection have a second, closer
  * entry in the connection sheet, beside the log they need.
+ *
+ * "What is Belt Control?" is the way back to the welcome sheet a first visit opens on
+ * its own. It leads the row because it is the one a newcomer is looking for.
  */
 export function Disclaimer() {
   return (
@@ -42,6 +46,7 @@ export function Disclaimer() {
         treadmills this app works with.
       </p>
       <p class="disclaimer-links">
+        <WelcomeLink />
         <a href="#/legal">Safety, terms &amp; privacy</a>
         <FeedbackLink />
       </p>
diff --git a/apps/web/src/components/WelcomeSheet.tsx b/apps/web/src/components/WelcomeSheet.tsx
new file mode 100644
index 0000000..88ab46f
--- /dev/null
+++ b/apps/web/src/components/WelcomeSheet.tsx
@@ -0,0 +1,112 @@
+import { signal } from '@preact/signals';
+import { useEffect } from 'preact/hooks';
+import { Sheet } from './Sheet.js';
+import { sessions } from '../state/session.js';
+import { STORAGE_KEYS, readRaw, writeRaw } from '../lib/storage.js';
+import { trackEvent } from '../lib/analytics.js';
+
+/** The written page this sheet summarises. A real path rather than a hash route, so
+ *  the long version is something a crawler can read too — see docs/deploying.md. */
+export const ABOUT_PATH = '/what-is-belt-control';
+
+// Shown on its own once, on a first visit. A browser that already holds walks belongs
+// to somebody who knows what this is, which covers everyone who used the app before
+// the sheet existed. Unreadable storage reads as "not seen", the same safe direction
+// DesktopOnlyNotice takes: the cost is seeing a short explanation twice.
+const firstVisit = readRaw(STORAGE_KEYS.welcome) !== '1' && sessions.value.length === 0;
+
+/** Open the sheet. Exported so the footer can bring it back on any screen. */
+export const welcomeOpen = signal(firstVisit);
+
+// The app mounts this in either layout, and crossing the desktop breakpoint swaps one
+// for the other — so "first" is reported once per load, not once per mount.
+let firstReported = false;
+
+// Private mode may refuse the write, and then it simply comes back next load.
+const markSeen = () => writeRaw(STORAGE_KEYS.welcome, '1');
+
+function close() {
+  welcomeOpen.value = false;
+  markSeen();
+}
+
+/**
+ * What Belt Control is, for someone who has just landed on a page full of controls for
+ * a machine that is not connected yet.
+ *
+ * Deliberately short: three things it does, the one thing it needs, and the one safety
+ * rule. Everything longer lives on the written page it links to, which is also the
+ * copy search engines index — the hash-routed app has no URL of its own to give them.
+ *
+ * Rendered once at the top of the app rather than by the footer that reopens it, so a
+ * first visit that lands on the legal page (which has no footer) still gets it.
+ */
+export function WelcomeSheet() {
+  // From a mount effect rather than at module load: ES imports run before main.tsx
+  // installs the analytics provider, so an event fired at import goes nowhere.
+  useEffect(() => {
+    if (!firstVisit || firstReported) return;
+    firstReported = true;
+    trackEvent('welcome_shown', { first: true });
+  }, []);
+
+  if (!welcomeOpen.value) return null;
+
+  return (
+    <Sheet title="Welcome to Belt Control" onClose={close}>
+      <p class="welcome-lede">
+        A remote control for your walking pad, in a browser tab. It connects to a KingSmith
+        or WalkingPad treadmill over Bluetooth — no phone app, no account, nothing to
+        install.
+      </p>
+
+      <ul class="welcome-list">
+        <li>
+          <strong>Control the belt.</strong> Start, stop and set the speed from the computer
+          you're already working at.
+        </li>
+        <li>
+          <strong>See it as you walk.</strong> Time, distance, steps and calories, as far as
+          your treadmill reports them.
+        </li>
+        <li>
+          <strong>Keep a record.</strong> Every walk is saved automatically, with daily
+          goals and a 30-day history. It stays in this browser and is never uploaded.
+        </li>
+      </ul>
+
+      <p class="note">
+        You'll need Chrome, Edge or Opera on a computer, or Chrome on Android, and the
+        phone app closed — the treadmill talks to one device at a time. Only start the belt
+        when you can see it, and keep the treadmill's own stop within reach.
+      </p>
+
+      <div class="data-actions" style="margin-top:1rem">
+        <button class="btn primary" onClick={close}>
+          Get started
+        </button>
+        {/* Leaving for the long version counts as having seen it, so coming back
+            from that page does not open the short one on top of the app again. */}
+        <a class="btn" href={ABOUT_PATH} onClick={markSeen}>
+          Read more
+        </a>
+      </div>
+    </Sheet>
+  );
+}
+
+/** The footer's way back to the sheet. A button, not an anchor: it opens a dialog
+ *  rather than a page, the same reasoning as `FeedbackLink` beside it. */
+export function WelcomeLink() {
+  return (
+    <button
+      class="table-toggle"
+      onClick={() => {
+        trackEvent('welcome_shown', { first: false });
+        welcomeOpen.value = true;
+      }}
+    >
+      What is Belt Control?
+    </button>
+  );
+}
diff --git a/apps/web/src/lib/analytics.ts b/apps/web/src/lib/analytics.ts
index 6c8c551..91a5f01 100644
--- a/apps/web/src/lib/analytics.ts
+++ b/apps/web/src/lib/analytics.ts
@@ -35,6 +35,10 @@ export interface AnalyticsEvents {
    *  ordinary page view; this covers movement the URL bar alone cannot show. */
   route_viewed: { route: string };
   ambient_entered: undefined;
+  /** The welcome sheet came up. `first` separates the automatic first-visit showing
+   *  from someone reopening it from the footer — the second is the signal that it is
+   *  worth keeping a way back to. */
+  welcome_shown: { first: boolean };
 
   // --- connection funnel: attempted → connected, or cancelled/failed ---------
   connect_attempted: { filtered: boolean };
diff --git a/apps/web/src/lib/storage.ts b/apps/web/src/lib/storage.ts
index 5b7bbc2..23bfa7a 100644
--- a/apps/web/src/lib/storage.ts
+++ b/apps/web/src/lib/storage.ts
@@ -29,6 +29,7 @@ export const STORAGE_KEYS = {
   openSession: 'wp.session.open.v1',
   settings: 'wp.settings.v1',
   desktopNotice: 'wp.desktopNotice.dismissed.v1',
+  welcome: 'wp.welcome.seen.v1',
 } as const;
 
 export type StorageKey = (typeof STORAGE_KEYS)[keyof typeof STORAGE_KEYS];
diff --git a/apps/web/src/styles/app.css b/apps/web/src/styles/app.css
index 506b2fc..b1390cb 100644
--- a/apps/web/src/styles/app.css
+++ b/apps/web/src/styles/app.css
@@ -878,6 +878,11 @@ a { color: var(--accent); }
 }
 .disclaimer-links .table-toggle { font-size: inherit; }
 
+/* The welcome sheet: the one dialog that is prose rather than a form. */
+.welcome-lede { margin: 0 0 0.75rem; }
+.welcome-list { margin: 0 0 0.75rem; padding-left: 1.1rem; }
+.welcome-list li { margin-bottom: 0.4rem; }
+
 /* --- legal page ------------------------------------------------------------
    Long-form prose, which exists nowhere else in this app — every other screen is
    numbers and controls. Measure is capped well under the desktop content width:
diff --git a/docs/deploying.md b/docs/deploying.md
index 5de90c9..0b37772 100644
--- a/docs/deploying.md
+++ b/docs/deploying.md
@@ -112,18 +112,19 @@ either.
 
 ## The written pages
 
-Four ordinary HTML files live in `apps/web/public/`, copied to `apps/web/dist/` verbatim and served as
+Five ordinary HTML files live in `apps/web/public/`, copied to `apps/web/dist/` verbatim and served as
 themselves:
 
 | Path | What it answers |
 |---|---|
+| `/what-is-belt-control` | What this is, what it is for, and what you need — the page the in-app welcome links to |
 | `/compatible-treadmills` | Will it work with my pad, and which numbers will it show |
 | `/walkingpad-without-the-app` | What you give up by not installing KS+Fit, and what you don't |
 | `/troubleshooting` | Why the chooser is empty, why a start is refused, why the link drops |
 | `/walkingpad-bluetooth-protocol` | The four BLE protocols, frame by frame — the one page written for developers |
 
-They exist because a hash-routed app is one URL, and one URL cannot answer four different
-questions to four different people arriving from four different searches. Every answer on
+They exist because a hash-routed app is one URL, and one URL cannot answer five different
+questions to five different people arriving from five different searches. Every answer on
 them was already written down — in the README, in `docs/protocols.md`, in the code
 comments — just not anywhere a crawler could reach it.
 
diff --git a/vercel.json b/vercel.json
index d85cc03..3119f87 100644
--- a/vercel.json
+++ b/vercel.json
@@ -5,7 +5,7 @@
   "trailingSlash": false,
   "rewrites": [
     {
-      "source": "/((?!assets/|compatible-treadmills|troubleshooting|walkingpad-|.*\\.).*)",
+      "source": "/((?!assets/|compatible-treadmills|troubleshooting|walkingpad-|what-is-belt-control|.*\\.).*)",
       "destination": "/index.html"
     }
   ],
@@ -23,7 +23,7 @@
       "headers": [{ "key": "Cache-Control", "value": "public, max-age=0, must-revalidate" }]
     },
     {
-      "source": "/(compatible-treadmills|troubleshooting|walkingpad-bluetooth-protocol|walkingpad-without-the-app)",
+      "source": "/(compatible-treadmills|troubleshooting|walkingpad-bluetooth-protocol|walkingpad-without-the-app|what-is-belt-control)",
       "headers": [{ "key": "Cache-Control", "value": "public, max-age=0, must-revalidate" }]
     },
     {