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id

de facto — unregistered request 2 spellings

Declared by 28 providers across 484 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.

idId

Providers declaring it (28)

ankorstore apache-couchdb arduino cedarai certifyos form3 isometric jp-morgan-chase kiteworks lianlian-global microsoft-power-pages mtn-group nuclei ocean-security onerail oracle ory outdoorsy physna picus-security replicate simplismart snappt solo-io tesslio treadio virustotal zededa

Explore

All headers Tracing & Correlation Guidance on headers.apievangelist.com