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Retry-After

IANA permanent response RFC 9110 reached by regulation 3 spellings

Declared by 330 providers across 13027 published specification files in the APIs.io network.

What this header is for, and how to use it →

A count here is providers whose published contract declares this header — not providers who send it. Response headers set at the edge rarely appear in an OpenAPI at all, so a low number can measure documentation practice rather than deployment.

Spelled 3 ways

HTTP field names are case-insensitive (RFC 9110 §5.1), so every spelling below is the same header on the wire. A contract is not the wire: generated clients key off the string, and a developer reading two of these sees two different headers.

Retry-Afterretry-afterretry-After

Reached by regulation

Basis: evidentiary. No law names this header; it is the deployed control for an obligation that regulation does impose. Observable at the edge, without credentials.

psd2

The registry

Statuspermanent
ReferenceRFC 9110, Section 10.2.3: HTTP Semantics

Providers declaring it (330)

3gpp 5dollarfootballapi abuseipdb acronis adanos-market-sentiment-api adobe adobe-creative-cloud adobe-photoshop adobe-suite adp aeternity agendapro ahasend akamai akamai-api-security aldermore algbra allica-bank allowance alphaai alphaloops anamai anchorbrowser anew anilist anrok anvil anyapi anyimagedetector api-pulse apiops-cycles-canvas appsmax-rest-api-v1 artifactories aruba asknicely aurora-solar authelia authenticx autocontent-api autoleadstar ava-protocol avaya azure-document-intelligence bank-of-ireland-uk bank-of-scotland barclays bezero-carbon bindbee bing-news bonitasoft booking-com box braintrust bud-co bureau-of-economic-analysis buttondown buywhere c-hoare-and-co california-privacy-protection-agency cashplus causa-prima ccpa channel99 chase-uk cint classic cledara closedloop cloud-foundry cms coasty cofactr common-room commonwealth-bank confluent confluent-the-data-streaming-platform connells contextdev coolify coutts coventry-building-society coveo credentially crob-at cynergy-bank danske-bank-uk delighted demodesk descript didit dietlyapi doit domscan dow-jones eclipse eigenpal elbo-ai-inc enrich-so entergram eod-historical eodhd es-pera etsi euler ev-energy eventedge-oracle everhour extreme-networks ezrentout factset farmdash fastino-labs featureflip feedly fenergo fieldguide first-direct flexai flightfinder folk footprint forum fossology fullstory gb-bank gc-ai gofundme gzw-data hakuna hampden-and-co have-i-been-pwned healthsherpa here hiring-index holidu honeycomb-io hubble-network igaming-tools imf immutable infer-by-flow7 influxdata influxdb inspectorio instapage interhyp investec jane-app jinba jira jp-morgan-chase just-eat kernel kernel-so kita kontaktio kroo lacuna lawmatics leadping leaflink leankit legal-ge-public-apis lemlist lengow lightspark lloyds-banking-group loudcrowd lucent macroscope maison-safqa-holdings-limited matter medblocks mediacaption-api mem messagebird messaging-api metalend method-financial methodfi microsoft-azure microsoft-azure-active-directory microsoft-azure-batch microsoft-azure-cache-for-redis microsoft-azure-cdn microsoft-azure-cost-management microsoft-azure-data-factory microsoft-azure-functions microsoft-azure-kubernetes-service microsoft-office-365 microsoft-outlook microsoft-quantum millimetric mlsgrid moengage moneris mongodb monid monument-bank mparticle musicbrainz mvmnt nationbuilder natural-ai natwest newstore nexscope nexthink notion novu npr offendersearch offendersearch-api omni onesignal onetrust open-banking-uk openfeature openmercantil opentelemetry oracle oracle-cloud oracle-platforms orders-api outbrain outline overshoot overshootai p2flux-api pagesnap palo-alto-networks paragon-bank peertube pennylane persons-api ping-identity pinkfish pipedream pixee-ai planning-center plex power-platform power-query prezent primitive princess-beef-heavy-industries prisma products-api provet-cloud publora pydantic-ai qliksense qr-code-crafter radius recipe-api recognise-bank respond revolut rigetti rigetti-and-co rigetti-computing rightnow routebase rowguard sageox sailpoint santander-uk sap-ariba scanverity-resolution-api schemasure secure-trust-bank seismic shawbrook-bank siftingio silna silverflow six-group snyk social-fetch socket socket-dev spaceship spp state-street stayingapi stotles strand-ai sumble supra sylvia-api tachyus tandem-bank testrail the-climate-corporation the-index-fyi transcend-io treasure-data trengo trino triple-whale tvarka ubiquiti uphold uploadcare usacallerlookup valueserp vanquis-banking-group vectorizer-ai vehicles-dev-api vettly viator vibes-platform vicai visa voltair webex wegtultrarich wise xquik-api yorkshire-building-society yousign z-league zalando zapier zendesk zerion znanylekarz zopa zuplo zyte

Explore

All headers Rate Limiting & Quota Guidance on headers.apievangelist.com

Work with this as data

Every header here is available over the APIs.io API and to AI agents over MCP. HTTP Headers is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for http headers

3 MCP tools reach this
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
Search the catalog
curl "https://apis.io/api/v1/search?q=retry-after&limit=10"
Everything under a tag
curl "https://apis.io/api/v1/tags/retry-after"

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