{"uid":"cap_-IxcJe8ScUBRWwV4-Nd2j","slug":"ipv4-fr-http-headers-fetch-e7a4cf0a","name":"ipv4.fr HTTP Headers Fetch","description":"Fast, reliable network tools API. IP geolocation, DNS lookup, SSL check, WHOIS, email validation, port scan. Free tier available.","url":"https://ipv4.fr/x402/v1/headers?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"http(s) URL or bare domain"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"url":"https://example.com","status":200,"headers":{"server":"ECS"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_FzzWI5sNVi98LUKix_61y","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches HTTP response headers from any URL or domain via a server-side GET request","exampleAgentPrompt":"Can you fetch the HTTP response headers for https://example.com so I can see what server it's running and whether it has security headers like HSTS or CSP set?","exampleUseCases":[{"title":"Security header audit for a site","prompt":"Check what HTTP security headers https://mybusiness.com is returning — I want to see if HSTS, Content-Security-Policy, and X-Frame-Options are set."},{"title":"Identify server technology stack","prompt":"What web server software is running behind https://competitor.com? Fetch its response headers so I can see the Server and X-Powered-By fields."},{"title":"Debugging CDN caching behavior","prompt":"Fetch the response headers for https://api.myapp.io/data and tell me what Cache-Control and X-Cache headers it's returning — I'm trying to figure out why responses aren't being cached."}],"resultDescription":"Returns a JSON object containing the target URL, the HTTP status code of the response, and a dictionary of all HTTP response headers returned by the server (e.g. server, content-type, cache-control, strict-transport-security, x-frame-options, etc.).","failureModes":["Invalid or unreachable URL returns an error or non-200 status","Timeout if the target server is slow or unresponsive","HTTPS URLs with invalid SSL certificates may fail or return error","Private/internal IP addresses may be blocked for security","Redirect chains may or may not be followed depending on implementation"],"whenToPreferThis":"Use this endpoint when you need to inspect the actual HTTP response headers a server sends for a given URL without making the request client-side. Ideal for security audits (checking HSTS, CSP, X-Frame-Options), debugging caching behavior, identifying server technology, or verifying CDN/proxy configuration. Prefer this over browser-based inspection when you need programmatic, server-side header retrieval at scale.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T12:38:11.688Z","isFirstParty":false,"canonicalSlug":"ipv4-fr-http-headers-fetch-e7a4cf0a"}