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Forest Gas Station URL Preflight
x402
Forest Gas Station URL Preflight is a paid API for AI agents from http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-29).
Performs a bounded HTTP HEAD/GET preflight on a public URL, returning origin status, final URL, redirect chain, response headers, cache validators, and optional SHA256 body hash.
Price / call$0.001
Success—
StatusUnknown
How this service works
Inspect a public URL with HEAD; GET only on 405/501. Return origin status, final URL, headers, cache validators and up to 5 redirects. Limits: 8s, 2 MiB. Origin 4xx/5xx are observations; length is unverified and SHA256 covers only complete GET bodies. No JavaScript, login or availability guarantee. Base mainnet USDC
Output
Returns the HTTP status code, final resolved URL, up to 5 redirect hops, all response headers, cache validators (ETag, Last-Modified), content length (unverified), and SHA256 hash of the body (only for complete GET responses where HEAD returned 405/501). Response is bounded to 8 seconds and 2 MiB. Origin 4xx/5xx errors are reported as observations rather than API failures.
Example use cases
Verify redirect chain before crawling
“Before I scrape that page, can you check https://bit.ly/3xYzAbc and tell me where it ultimately redirects to and whether the final URL is returning a 200?”
Cache header inspection for CDN audit
“Can you probe https://assets.mycdn.com/bundle.js and tell me what Cache-Control and ETag headers the server is returning?”
Pre-flight link validation for newsletter
“I have a link I'm about to include in my newsletter — can you quickly check if https://mybrand.com/promo-2024 is live, what status it returns, and whether it redirects anywhere?”
Technical details
Endpoint
POSThttps://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/url/preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight HTTP metadata about a URL — status, headers, redirects, cache validators — without downloading the full body. Ideal as a pre-flight step before heavier scraping or download operations, or for validating that a link is live and resolves correctly. Prefer this over full-page scrapers when you only need HTTP-level metadata, not page content or JavaScript-rendered output.
Side effects
- Invalid or non-public URL (private IP, reserved DNS, credentials included) — rejected before network call, not settled
- Timeout after 8 seconds — request fails, not charged
- Response body exceeds 2 MiB cap — truncated, SHA256 not computed
- Origin server returns 4xx/5xx — reported as observation, still charged on success path
- HTTPS downgrade attempt rejected
- Non-port-80/443 URLs rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Absolute public HTTP(S) URL on port 80/443. No credentials. Private/reserved DNS/IPs and HTTPS downgrades rejected. |
Tags
x402
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