HTTP Cache Header Analyzer | Cache-Control TTL

Paste HTTP response headers to see effective cache lifetime, whether shared or private caches can store the response, and any conflicting directives. Free. Designed specifically for developers and professionals, this free online analyzer runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

Also known as: http cache header analyzer · cache control header analyzer · check cache control ttl · http caching header checker · analyze response cache headers · cache control vs expires · etag and last modified checker · http cache debugging tool

api and http tools

devops and infrastructure tools

analyzers

Response Headers

Cache Analysis

Cache analysis will appear here

Paste response headers and click Analyze Headers to see effective TTL and warnings.

About HTTP Cache Header Analyzer

Paste the response headers from a curl -i request or your browser's Network tab to see exactly how long a cache is allowed to keep this response, and whether shared caches (CDNs, proxies) may store it at all.

Key Features

Computes private (browser) and shared (CDN/proxy) freshness lifetimes separately, since s-maxage overrides max-age for shared caches only
Subtracts the Age header to show remaining time-to-live, not just the raw max-age value
Flags contradictory directive combinations: no-store with max-age, no-cache with immutable, private with s-maxage
Detects Vary: * and explains why it makes a response effectively uncacheable
Falls back to Expires when there is no max-age, and says so when there is no Date header to compute it from

Use Cases

Debugging why a CDN keeps serving a stale asset after a deploy
Checking whether an API response can be safely cached at a shared proxy without leaking private data
Verifying a static asset pipeline is sending long max-age plus immutable correctly
Reviewing Cache-Control headers on a US-hosted API before a security or performance review

Supported Formats

Raw HTTP response headers, one per line (Cache-Control, Expires, Age, Date, ETag, Last-Modified, Vary, Pragma)

Related Keywords

http cache header analyzer

cache-control analyzer

cache-control max-age

s-maxage vs max-age

no-cache vs no-store

check cache ttl

What is the difference between no-cache and no-store?

no-store means a cache must never keep a copy of the response at all - every request goes to the origin. no-cache is less strict: a cache may store the response, but it must revalidate with the origin server before serving it again, even if it is not expired. no-cache with a validator (ETag or Last-Modified) usually costs only a cheap 304 Not Modified, while no-store costs a full response every time.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is HTTP Cache Header Analyzer used for?

Paste HTTP response headers to see effective cache lifetime, whether shared or private caches can store the response, and any conflicting directives. Free.

Is HTTP Cache Header Analyzer free to use?

Yes. HTTP Cache Header Analyzer is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use HTTP Cache Header Analyzer?

No. HTTP Cache Header Analyzer works immediately in your browser with no signup, login, or email address required.

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