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chore: change caching - #44
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📝 WalkthroughWalkthroughThe caching guide expands its overview into a detailed reference. It covers cache design, expiration, invalidation, HTTP controls, application and distributed caching, CDN behavior, security, observability, testing, examples, and decision criteria. ChangesCaching Guide
Estimated code review effort: 3 (Moderate) | ~25 minutes Possibly related PRs
Suggested reviewers: Poem
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Actionable comments posted: 3
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@frontend/content/caching.mdx`:
- Around line 860-866: Update the stale-data example so any cached value is
returned, including when expired; when the cached value is expired, invoke
refreshInBackground(key) without awaiting it before returning the stale value.
Preserve the existing behavior for cache misses.
- Around line 385-387: Update the cache poisoning definition near the Vary
discussion in caching.mdx to describe attacker-controlled content being stored
under a cache key and served to other users, matching the definition already
used near line 701. Reclassify the cross-user reuse caused by an incomplete
cache key as cache leakage or incorrect cache reuse, while preserving the
surrounding Vary guidance.
- Around line 150-156: Update the makeKey helper to normalize parameter ordering
before constructing the cache key: sort Object.keys(params), serialize the
sorted key/value pairs deterministically, and join them into the key. Preserve
the prefix while ensuring equivalent objects with different insertion orders
produce the same result.
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frontend/content/caching.mdx
| - Example Node.js with a helper: | ||
|
|
||
| ```js | ||
| const cacheKey = `user:${userId}:profile`; | ||
| function makeKey(prefix, params) { | ||
| return `${prefix}:${JSON.stringify(params)}`; | ||
| } | ||
| ``` |
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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win
The key helper contradicts the normalization guidance above it.
Line 114 tells the reader to normalize inputs so equivalent requests produce the same key. JSON.stringify(params) preserves insertion order, so {a:1,b:2} and {b:2,a:1} produce different keys for the same logical request. Line 675 lists exactly this as an anti-pattern. Show a normalizing helper instead.
♻️ Proposed helper that normalizes key order
```js
function makeKey(prefix, params) {
- return `${prefix}:${JSON.stringify(params)}`;
+ const normalized = Object.keys(params)
+ .sort()
+ .map((k) => `${k}=${params[k]}`)
+ .join('&');
+ return `${prefix}:${normalized}`;
}</details>
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<details>
<summary>📝 Committable suggestion</summary>
> ‼️ **IMPORTANT**
> Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
```suggestion
- Example Node.js with a helper:
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@frontend/content/caching.mdx` around lines 150 - 156, Update the makeKey
helper to normalize parameter ordering before constructing the cache key: sort
Object.keys(params), serialize the sorted key/value pairs deterministically, and
join them into the key. Preserve the prefix while ensuring equivalent objects
with different insertion orders produce the same result.
| - Omitting `Vary` when the response differs by request context can cause cache poisoning or incorrect reuse. | ||
| - Cache poisoning is when a cached response is served to a different user because the cache did not distinguish the request context. | ||
| - Adding `Vary` is a common mitigation for this issue. |
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🔒 Security & Privacy | 🟡 Minor | ⚡ Quick win
Fix the cache poisoning definition. It conflicts with line 701.
Line 386 describes cross-user response reuse. That failure mode is cache leakage caused by an incomplete cache key, not cache poisoning. Cache poisoning is an attacker storing an attacker-controlled response under a key that other users request. Line 701 already states the correct meaning, so the guide defines one term two ways.
📝 Proposed wording fix
-- Omitting `Vary` when the response differs by request context can cause cache poisoning or incorrect reuse.
--- Cache poisoning is when a cached response is served to a different user because the cache did not distinguish the request context.
--- Adding `Vary` is a common mitigation for this issue.
+- Omitting `Vary` when the response differs by request context can cause incorrect reuse across users.
+- Incorrect reuse happens when a shared cache serves one user's response to another user because the cache key did not include the distinguishing request context.
+- Cache poisoning is a related but distinct attack in which an attacker stores an attacker-controlled response under a key that other users request.
+- Adding `Vary`, or excluding the response from shared caches, mitigates incorrect reuse.📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| - Omitting `Vary` when the response differs by request context can cause cache poisoning or incorrect reuse. | |
| - Cache poisoning is when a cached response is served to a different user because the cache did not distinguish the request context. | |
| - Adding `Vary` is a common mitigation for this issue. | |
| - Omitting `Vary` when the response differs by request context can cause incorrect reuse across users. | |
| - Incorrect reuse happens when a shared cache serves one user's response to another user because the cache key did not include the distinguishing request context. | |
| - Cache poisoning is a related but distinct attack in which an attacker stores an attacker-controlled response under a key that other users request. | |
| - Adding `Vary`, or excluding the response from shared caches, mitigates incorrect reuse. |
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@frontend/content/caching.mdx` around lines 385 - 387, Update the cache
poisoning definition near the Vary discussion in caching.mdx to describe
attacker-controlled content being stored under a cache key and served to other
users, matching the definition already used near line 701. Reclassify the
cross-user reuse caused by an incomplete cache key as cache leakage or incorrect
cache reuse, while preserving the surrounding Vary guidance.
| - Example of using stale data while revalidating: | ||
|
|
||
| ```js | ||
| if (cached && !expired) { | ||
| return cached; | ||
| } | ||
| ``` |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
The example does not show stale-while-revalidate.
The caption promises serving stale data during a refresh. The snippet returns the cached value only when it is fresh, and it never triggers a background refresh. Readers copying this get plain cache-aside behavior.
📝 Proposed example that matches the caption
```js
-if (cached && !expired) {
- return cached;
-}
+if (cached) {
+ if (expired) {
+ // Serve stale now, refresh in the background.
+ void refreshInBackground(key);
+ }
+ return cached;
+}</details>
<details>
<summary>🤖 Prompt for AI Agents</summary>
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In @frontend/content/caching.mdx around lines 860 - 866, Update the stale-data
example so any cached value is returned, including when expired; when the cached
value is expired, invoke refreshInBackground(key) without awaiting it before
returning the stale value. Preserve the existing behavior for cache misses.
</details>
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