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Retry-After

IANA permanent response RFC 9110 reached by regulation 3 spellings

Declared by 229 providers across 7691 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

Status	permanent
Reference	RFC 9110, Section 10.2.3: HTTP Semantics

Providers declaring it (229)

3gpp abuseipdb adobe-creative-cloud adobe-photoshop akamai akamai-api-security aldermore algbra allica-bank allowance anamai anchorbrowser anilist anrok anthropic anvil api-pulse apiops-cycles-canvas appsmax-rest-api-v1 aruba asknicely aurora-solar authenticx autoleadstar ava-protocol azure-document-intelligence bank-of-ireland-uk bank-of-scotland bezero-carbon bing-news box braintrust bud-co bureau-of-economic-analysis buywhere c-hoare-and-co cashplus causa-prima chase-uk cint cisco-webex classic coasty cofactr common-room commonwealth-bank connells contextdev coolify coutts coventry-building-society coveo credentially cynergy-bank delighted demodesk descript didit eigenpal elbo-ai-inc eod-historical eodhd etsi euler everhour extreme-networks ezrentout factset fastino-labs fieldguide first-direct flexai folk footprint forum fossology fullstory gb-bank gc-ai gofundme hakuna hampden-and-co have-i-been-pwned healthsherpa holidu honeycomb-io hubble-network imf influxdata influxdb inspectorio interhyp investec jane-app jinba jp-morgan-chase just-eat kernel kernel-so kita kroo lacuna leaflink leankit legal-ge-public-apis lightspark lloyds-banking-group lucent macroscope maison-safqa-holdings-limited matter mem messaging-api metalend method-financial methodfi microsoft-azure microsoft-azure-active-directory microsoft-azure-functions microsoft-azure-kubernetes-service microsoft-office-365 microsoft-outlook microsoft-quantum millimetric mlsgrid moengage moneris mongodb monid monument-bank musicbrainz mvmnt nationbuilder natural-ai natwest newstore nexthink notion novu npr omni open-banking-uk openfeature openmercantil opentelemetry oracle orders-api outline overshoot overshootai palo-alto-networks paragon-bank peertube pennylane persons-api ping-identity pinkfish pipedream pixee-ai planning-center plex power-platform prezent primitive princess-beef-heavy-industries prisma products-api provet-cloud pydantic-ai radius recipe-api recognise-bank respond revolut rigetti rigetti-and-co rigetti-computing rightnow sageox sailpoint santander-uk sap-ariba secure-trust-bank seismic shawbrook-bank silna six-group snyk socket socket-dev spaceship spp state-street stayingapi strand-ai sumble tachyus tandem-bank testrail the-climate-corporation the-index-fyi transcend-io trengo trino triple-whale tvarka-atk-api ubiquiti uphold uploadcare valueserp vanquis-banking-group viator vibes-platform vicai visa voltair we-ultrarich webex wise xquik-api yorkshire-building-society yousign z-league zalando zapier zendesk zerion zopa zuplo

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