Protocol
obsoleted
Registered with IANA and declared by no provider in the APIs.io network.
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.
The registry
| Status | obsoleted |
|---|---|
| Reference | PICS Label Distribution Label Syntax and Communication Protocols |
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