{"uid":"cap_LGCLx_xzgUHhQ7_Pnu_4X","slug":"http-header-checker-04c187ea","name":"HTTP Header Checker","description":"Sends a request to a web address you provide and reports back everything the server said in response: the status code, all the response headers, how many times it got redirected, and how long the whole thing took.","url":"https://http-header-checker.underscoredone.com/check","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","description":"The full web address to check, including http:// or https://"},"method":{"type":"string","description":"Either GET or HEAD; GET fetches the page normally, HEAD only asks for headers without the body"},"follow_redirects":{"type":"boolean","description":"Whether to follow redirects to their final destination or stop at the first one"}}},"responseSchema":{"type":"json","example":{"url":"https://example.com","headers":{"server":"nginx","content-type":"text/html; charset=UTF-8","cache-control":"max-age=600","content-length":"1256"},"final_url":"https://example.com/","api_version":"1.0.0","status_code":200,"redirect_chain":[{"url":"http://example.com","status_code":301}],"response_time_ms":214,"missing_security_headers":["strict-transport-security","content-security-policy"]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_qBg34E0ey5d5Cwg-OnzvY","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches and returns the HTTP response headers, status code, redirect chain, and missing security headers for any given URL","exampleAgentPrompt":"Can you check the HTTP response headers for https://myblog.com — use a GET request and follow any redirects so I can see the final URL, status code, and any missing security headers?","exampleUseCases":null,"resultDescription":"Returns a JSON object containing the HTTP status code, all response headers as key-value pairs, the final URL after redirects, the full redirect chain with intermediate status codes, response time in milliseconds, and a list of missing security headers such as strict-transport-security and content-security-policy.","failureModes":["Target URL is unreachable or times out — returns network error or timeout response","Invalid URL format provided — returns validation error","URL uses an unsupported scheme — returns error","Domain does not resolve (DNS failure) — returns connection error","Target server returns an unexpected non-HTTP response — may return partial or error result"],"whenToPreferThis":"Use this endpoint when you need to programmatically inspect HTTP response headers, status codes, redirect chains, or security header presence for any URL — especially useful for site audits, security checks, redirect debugging, or verifying CDN/cache configurations. Prefer this over a generic web scraper when you only need header metadata and not page content.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T00:37:03.512Z","isFirstParty":false}