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API · /http-api

HTTP Reference API

healthy 4,835 Subscribers

A clean, programmatic reference for HTTP semantics, built on the official IANA registries. Look up any status code with its reason phrase and class (404 → Not Found, Client Error; 503 → Service Unavailable, Server Error), list a whole class (4xx, 5xx…); look up any method with its safe/idempotent flags (GET → safe + idempotent, POST → neither, DELETE → idempotent); or look up / search the 255 registered HTTP header fields (Content-Type, Authorization, …) with their registration status. Ideal for API tooling, HTTP clients, documentation, linters, learning resources and error pages.

#http #status-codes #headers #methods #iana #reference
api.oanor.com/http-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
79 ms
Server probes · 24h
Subscribers
4,835
active
Total calls
248
last 7 days
status Full status page → · 24 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 20,000 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 20,000 calls/month
  • 2 req/sec
  • Status + methods + headers
  • No credit card
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Starter

€2.00 /month

  • 150,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 150k calls/month
  • 8 req/sec
  • Class & header search
  • Email support
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Pro

€6.00 /month

  • 700,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 700k calls/month
  • 20 req/sec
  • Tooling / linters
  • Priority support
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Mega

€18.00 /month

  • 3,500,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 3.5M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Built by

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Security Headers API

Fetch any URL and analyse its HTTP response security headers — grading the site A+ to F the way securityheaders.com and Mozilla Observatory do. Pass a URL and the service makes the request server-side (following redirects), then reports which protective headers are present, which are missing (with concrete remediation advice) and which response headers leak information. Graded headers include Strict-Transport-Security (HSTS), Content-Security-Policy, X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy and Cross-Origin-Opener-Policy; information-leak headers include Server and X-Powered-By. A companion endpoint returns every raw response header. Private and internal targets are refused (SSRF-guarded). Built for security audits, CI/CD security gates, attack-surface reviews and compliance checks. A security-header grader — distinct from the SSL/TLS certificate check (sslcheck), host reachability (hostcheck), the IANA HTTP status-code reference (http) and the on-page SEO audit (seo). No upstream key, no cache.

api.oanor.com/secheaders-api

IP Protocol Numbers API

The IANA "Assigned Internet Protocol Numbers" registry as an API — the 8-bit value carried in the IPv4 Protocol field (and IPv6 Next Header) that identifies the encapsulated protocol. Resolve any number to its protocol (e.g. 6 → TCP, 17 → UDP, 1 → ICMP, 47 → GRE, 50 → ESP, 58 → IPv6-ICMP, 89 → OSPF, 132 → SCTP), look up by keyword, search by name, or list all 151 assigned protocols — each with its keyword, full name, IPv6-extension-header flag and defining RFC. Ideal for packet/firewall tooling, network analysis, NetFlow/IPFIX decoders and protocol documentation. (Distinct from transport-layer service port numbers.)

api.oanor.com/ipprotocols-api

URI Schemes API

The IANA Uniform Resource Identifier (URI) Schemes registry as an API — all 413 registered schemes (http, https, mailto, tel, ftp, ssh, magnet, bitcoin, geo, did, …). Look up any scheme to get its description, registration status (Permanent, Provisional or Historical) and defining reference; search by name or description; or list all schemes filtered by status. Ideal for URL parsers and validators, link handlers, deep-linking, security allow-lists and developer tooling that needs to recognise or vet URI schemes.

api.oanor.com/urischemes-api

Network Ports API

The official IANA Service Name and Transport Protocol Port Number registry as an API — 12,500+ TCP, UDP, SCTP and DCCP port assignments. Look up what service runs on a port (e.g. 443 → https), find which port(s) a named service uses (e.g. ssh → 22), and search the registry by service or description. A handy reference for networking, DevOps, security and firewall tooling.

api.oanor.com/netports-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for HTTP Reference API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call HTTP Reference API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for HTTP Reference 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 Reference API cost?
HTTP Reference API has a free tier with 100 calls / month. Paid plans start at €2.00 / 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 Reference API GDPR-compliant?
All requests to HTTP Reference 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/http-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/http-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/http-api/SOME_PATH");
curl_setopt($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/http-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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