---
title: "Inspect a URL before an autonomous agent calls it, and preflight or verify a website or external API endpoint is healthy and safe to call by checking HTTP status, redirects, latency, and security headers."
method: POST
path: "/v1/url-http-preflight"
tags: ["http", "url", "inspect", "preflight", "external", "api", "endpoint", "status", "redirect", "redirects", "latency", "security", "headers", "verify", "website", "health", "healthy", "safe", "call", "calls", "diagnostics", "autonomous", "agent", "web"]
---

# Inspect a URL before an autonomous agent calls it, and preflight or verify a website or external API endpoint is healthy and safe to call by checking HTTP status, redirects, latency, and security headers.

`POST /v1/url-http-preflight`

## Request

- Base URL: `https://api.salt19.com`
- URL: `https://api.salt19.com/v1/url-http-preflight`
- Auth: none required

HTTP endpoint preflight for autonomous agents. Inspect a public URL for live status, redirects, latency, content type, cache controls, robots directives, and common security headers before an agent depends on, calls, monitors, integrates, or deploys against the endpoint.

## Headers

- `Idempotency-Key` string

## Request body

- object
  - `url` string, uri, required

## Response `200`

Successful paid result

## Other responses

- `402`: x402 payment required

---

[API](https://skmtc.dev/salt19/apis/salt19-agent-utility-grid.md) · [All operations](https://skmtc.dev/salt19/apis/salt19-agent-utility-grid/llms.txt) · [OpenAPI document](https://skmtc.dev/salt19/apis/salt19-agent-utility-grid/revisions/c2520ca8ffbf?raw)