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API · /httpstatus-api

HTTP Status API

healthy 4,187 Subscribers

Every HTTP status code as an API. Look up any code (e.g. 404, 429, 503) and get its standard reason phrase, its class (1xx Informational, 2xx Success, 3xx Redirection, 4xx Client Error, 5xx Server Error), a plain-English description, the RFC that defines it, and handy flags for whether it is an error and whether it is commonly safe to retry (408, 425, 429, 500, 502, 503, 504). List every assigned code or filter by class, and enumerate the five status classes. Perfect for API clients and gateways, error pages, logging and monitoring dashboards, documentation and teaching. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. Distinct from host/uptime checkers that report a live status — this is the reference dictionary of the codes themselves.

#http #status-codes #reference #web #rest #developer-tools
api.oanor.com/httpstatus-api
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Machine-readable spec so AI agents can integrate this API.

/api/httpstatus-api/openapi.json
/api/httpstatus-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
92 ms
Server probes · 24h
Subscribers
4,187
active
Total calls
56
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 680 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 680 calls/month
  • 2 req/sec
  • Lookup + list + categories
  • No credit card
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Starter

€0.70 /month

  • 5,300 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 5.3k calls/month
  • 8 req/sec
  • All assigned codes + RFCs
  • Email support
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Pro

€18.20 /month

  • 121,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 121k calls/month
  • 20 req/sec
  • Gateway / monitoring pipelines
  • Priority support
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Mega

€54.20 /month

  • 625,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 625k calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

CORS API

Build correct CORS response headers and evaluate preflight requests — without re-reading the spec every time. The headers endpoint turns a simple policy (allowed origins, methods, request headers, whether credentials are allowed, a preflight max-age and any exposed response headers) into the exact set of Access-Control-* headers to return, and it handles the parts people get wrong: you cannot combine a wildcard origin with credentials, so it reflects the specific request origin and adds Vary: Origin instead; it omits the allow-origin header when an origin is not on your list; and it warns when a configuration would not behave as expected. The check endpoint takes an incoming request — its Origin, the (requested) method and the Access-Control-Request-Headers — and tells you whether it would pass CORS, the precise reason if it fails, and the response headers you should send back. Everything is computed locally and deterministically, so it is instant and private. Ideal for API gateways and backends, edge and serverless functions, debugging browser CORS errors, and getting a security policy exactly right. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This builds and checks the headers; it does not make a cross-origin request — to inspect a live site's security headers use a security-headers API.

api.oanor.com/cors-api

Client IP API

Find the real client IP behind proxies, CDNs and load balancers. The client endpoint takes an X-Forwarded-For list (or an RFC 7239 Forwarded header) together with a count of proxies you trust, and returns the actual client address — stripping the trusted proxies from the right-hand side so that a spoofed left-most value cannot fool you — along with the full ordered hop chain, the left-most and right-most entries and the address family. The parse endpoint decomposes a Forwarded header into its for/by/host/proto hops, or an X-Forwarded-For header into its ordered list of addresses, stripping ports and IPv6 brackets so you get clean IPs. Getting this right matters for security: trusting the wrong entry lets clients spoof their IP, so the trusted-proxy model returns the first address you did not put there yourself. Everything is computed locally and deterministically, so it is instant and private. Ideal for reverse proxies and API gateways, rate limiting and abuse prevention, audit logging and analytics, geo and fraud checks, and any backend sitting behind a load balancer. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This parses forwarding headers to find the client IP; to geolocate that IP use an IP-geolocation API.

api.oanor.com/clientip-api

Content-Disposition API

Parse and build HTTP Content-Disposition headers (RFC 6266, with RFC 5987 filename* encoding). The parse endpoint reads a header into its disposition type (attachment, inline or form-data), its filename — correctly decoding the extended filename*=UTF-8''… form and preferring it over a plain filename exactly as the specification requires — the form-data field name, and any remaining parameters. The build endpoint assembles a correct header from simple fields and, when a filename contains non-ASCII characters (accents, emoji, CJK), automatically emits both an ASCII fallback filename and the percent-encoded filename*, so every browser shows the right download name while older clients still work. Everything is computed locally and deterministically, so it is instant and private — no file is ever fetched or stored. Ideal for file-download and upload endpoints, object storage and CDNs, content gateways and proxies, email and multipart handling, and debugging why a download is mis-named. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This builds and parses the header string itself; it does not serve a file.

api.oanor.com/contentdisposition-api

Cache-Control API

Parse and build HTTP Cache-Control headers (RFC 9111). The parse endpoint turns a Cache-Control header into structured, named directives — public and private, no-store, no-cache, no-transform, max-age and s-maxage, must-revalidate and proxy-revalidate, immutable, stale-while-revalidate, stale-if-error, min-fresh and max-stale — together with a quick summary: whether the response is cacheable, whether it must be revalidated before use, its visibility (public or private) and its max-age in seconds. The build endpoint assembles a correct, canonically-ordered header from simple boolean and numeric fields, validating that the second-based directives are non-negative integers and quoting field-list forms of no-cache and private. Everything is computed locally and deterministically, so it is instant and private. Ideal for CDN and edge configuration, caching proxies and reverse proxies, API responses and static-asset tuning, and debugging why a response is (or is not) being cached. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This builds and parses the header string itself; it does not fetch a URL.

api.oanor.com/cachecontrol-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for HTTP Status API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call HTTP Status API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for HTTP Status API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does HTTP Status API cost?
HTTP Status API has a free tier with 100 calls / month. Paid plans start at €0.70 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is HTTP Status API GDPR-compliant?
All requests to HTTP Status API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/httpstatus-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/httpstatus-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/httpstatus-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/httpstatus-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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