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SALT19 URL HTTP Preflight Check
x402
SALT19 URL HTTP Preflight Check is a paid API for AI agents from api.salt19.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).
Performs an HTTP preflight check on a given URL, returning final resolved URL, redirect count, latency, content type, and security header presence
Price / call$0.03
Success—
StatusUnknown
How this service works
SALT19 is an independent applied AI systems lab behind EvoMind governed cognition, the MCP-native Agent Utility Grid, the ARCS research community, AeroClear UAS flight intelligence, and practical software for real-world work.
Output
Returns a JSON object with the HTTP status code of the final response, the fully resolved final URL after all redirects, the number of redirects followed, round-trip latency in milliseconds, the content-type header value, and a set of boolean flags indicating presence of key security headers including x-content-type-options, content-security-policy, and strict-transport-security.
Example use cases
Verify redirect chain before scraping
“Can you preflight check https://bit.ly/3xYz123 for me — I need to know the final URL it lands on, how many hops it takes, and whether it returns a 200?”
Security header audit for a site
“Run an HTTP preflight on https://mycompany.io and tell me which security headers it's missing — especially content-security-policy and strict-transport-security.”
Latency and liveness check before agent action
“Before my agent tries to call https://partner-api.example.com/data, can you preflight it to confirm it's live and measure the response latency?”
Technical details
Endpoint
POSThttps://api.salt19.com/v1/url-http-preflightWhen to prefer
Choose this endpoint when an agent needs to safely inspect a URL before acting on it — resolving redirects, confirming liveness, measuring latency, or auditing security posture — without fully downloading the page body. Particularly useful as a lightweight pre-step before web scraping, link validation pipelines, or security audits where you want HTTP metadata without full content retrieval.
Side effects
- URL is unreachable or DNS fails — likely returns an error status or timeout
- Malformed URL input returns a validation error
- URL returns non-200 status (e.g. 404, 403) — status is reported but may indicate dead link
- Very high redirect chains may be truncated or cause timeout
- SSL/TLS errors on the target URL may cause connection failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string |
Output
Schema · Response
{
"type": "json",
"example": {
"status": 200,
"final_url": "https://example.com/",
"redirects": 0,
"latency_ms": 110,
"content_type": "text/html",
"security_headers": {
"x_content_type_options": true,
"content_security_policy": false,
"strict_transport_security": true
}
}
}Tags
x402
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