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Ocp-Apim-Subscription-Key

de facto — unregistered request 2 spellings

Declared by 34 providers across 423 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 2 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.

Ocp-Apim-Subscription-Keyocp-apim-subscription-key

Providers declaring it (34)

aemo alaska-air anomaly-detection azure-document-intelligence beazley best-practice bing-news buildxact centrica engineering-platform ercot fabric-origin fonoa halo-connect hometrack mediavalet microsoft microsoft-azure microsoft-bing microsoft-cognitive-services miso ofcom ordo qbe rainbow-ai regal-entertainment-group ryder-system scansource sportsdataio sun-life tradeverifyd un-comtrade vlex workspan

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All headers Authentication Guidance on headers.apievangelist.com