{"uid":"cap_r9eUABkHFvH3deu9Gphra","slug":"http-header-explainer-94f7e73d","name":"HTTP Header Explainer","description":"Explains HTTP headers: for each header name you give (comma-separated), what it does, typical values and an example, plus whether it is a request, response or both, and a security relevance flag. Covers 60+ common headers including security, caching, CORS, cookies and x402 payment headers. $0.01 per lookup.","url":"https://intel.rallylive.ca/dev/http-header-explain","method":"GET","headers":{},"bodySchema":{"type":"object","$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","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"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_-_LkSKGQf5ak26BrMQGfF","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":"Returns a detailed explanation of one or more HTTP header names, including their purpose, typical values, an example, whether they are request/response headers, and a security relevance flag.","exampleAgentPrompt":"Can you explain what the Strict-Transport-Security and Content-Security-Policy HTTP headers do — like what values they take and whether they're request or response headers?","exampleUseCases":[{"title":"Auditing security headers on a web app","prompt":"I'm reviewing my app's HTTP headers for security — can you explain what X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security do, including whether they're request or response headers and how security-critical they are?"},{"title":"Understanding CORS headers for API integration","prompt":"I keep getting CORS errors when calling an API — can you explain what the Access-Control-Allow-Origin, Access-Control-Allow-Headers, and Access-Control-Allow-Methods headers do and what values they typically take?"},{"title":"Learning about x402 payment headers","prompt":"I'm building an x402 payment-gated API — can you explain the X-402-Payment header, what it does, and what typical values look like?"}],"resultDescription":"For each queried header name, the endpoint returns what the header does, its typical values, a concrete example, whether it appears in requests, responses, or both, and a flag indicating its security relevance. Covers 60+ common headers spanning security, caching, CORS, cookies, and x402 payment headers.","failureModes":["Unknown or unsupported header name returns no explanation or an error","Malformed comma-separated input may cause parsing failures","Header names with typos may not match any known entry","Very new or non-standard headers outside the 60+ covered set may not be recognized"],"whenToPreferThis":"Use this endpoint when an agent or developer needs quick, structured explanations of HTTP headers by name — especially useful for documentation generation, security audits, onboarding workflows, or debugging unfamiliar headers. Prefer this over a generic web search when you need structured, machine-readable output (type, example, security flag) rather than free-form prose.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T13:12:06.614Z","isFirstParty":false}