Pricing

$20.00 / 1,000 url checkeds

HTTP Protocol Checker - HTTP/2, HTTP/3 & TLS Version API

Check which HTTP versions a site supports. Input: url. Output: JSON with http1_1, http2, http3 (via Alt-Svc), and negotiated TLS version per URL. Sync run-and-return, pay-per-result at $0.02 per URL checked - no subscription.

Pricing

$20.00 / 1,000 url checkeds

Rating

0.0

(0)

Developer

Anthony Snider

Actor stats

Bookmarked

Total users

Monthly active users

2 days ago

Last modified

HTTP Protocol & Version Checker

Find out which HTTP protocol versions any site actually supports — HTTP/1.1, HTTP/2, and HTTP/3 — plus the TLS version it negotiates.

Live on the Apify Store — run it instantly or call it as an agent tool via Apify MCP.

What you get

For each URL the actor:

Opens a real TLS connection with ALPN negotiation to detect HTTP/2 (h2) support and the TLS version (e.g. TLSv1.3).
Reads the Alt-Svc response header to detect whether HTTP/3 (h3) is advertised.
Reports the negotiated protocol and the final URL after redirects.

Accepts a single url or a bulk list of urls (domains work too — https:// is assumed). Each successful check is one billable result.

Input

{
  "url": "https://www.cloudflare.com",
  "urls": ["https://www.google.com", "example.com"],
  "maxUrls": 25
}

Field	Type	Description
`url`	string	Single URL or domain to check.
`urls`	array	Bulk list of URLs/domains (combined with `url`).
`maxUrls`	integer	Cap on URLs per run (1–50, default 25).

Output

One dataset item per URL:

{
  "url": "https://www.cloudflare.com",
  "finalUrl": "https://www.cloudflare.com/",
  "status": 200,
  "http2": true,
  "http3Advertised": true,
  "altSvc": "h3=\":443\"; ma=86400",
  "tlsVersion": "TLSv1.3",
  "negotiatedProtocol": "h2"
}

Failed lookups push { "url": "...", "error": "..." } so one bad host never breaks the run.

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