{"uid":"cap_Qd6n8-OX1W8NWHh6vKSTB","slug":"salt19-url-http-preflight-check-ccff518d","name":"SALT19 URL HTTP Preflight Check","description":"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.","url":"https://api.salt19.com/v1/url-http-preflight","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","format":"uri","maxLength":2048}}},"responseSchema":{"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}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2qs2I6sli4st-i3sM5o-D","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Performs an HTTP preflight check on a given URL, returning final resolved URL, redirect count, latency, content type, and security header presence","exampleAgentPrompt":"Before I scrape this page, can you do a preflight check on https://example.com and tell me the final URL it resolves to, how many redirects there are, and whether it has security headers like HSTS and CSP in place?","exampleUseCases":[{"title":"Verify redirect chain before scraping","prompt":"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?"},{"title":"Security header audit for a site","prompt":"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."},{"title":"Latency and liveness check before agent action","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T12:54:52.464Z","isFirstParty":false}