field Registered
Verified 2026-09-18 · registry updated 2026-08-28

HTTP field: Cross-Origin-Opener-Policy-Report-Only

Cross-Origin-Opener-Policy-Report-Only is a registered field in the IANA HTTP Field Name Registry. Structured Field type: Item.

HTTP fields are message metadata; their meaning depends on direction, combination rules, and the HTTP version carrying them. Use Cross-Origin-Opener-Policy-Report-Only only according to its defining specification. Defining reference: HTML.

httpheaderfieldregistrypermanentstructured-fields

Registry-backed field entry. The field is currently marked registered by IANA. Structured Field type: Item. Defining reference: HTML.

Check whether the field is end-to-end or hop-by-hop, whether it varies a cache response, and whether it carries security-sensitive data before forwarding or logging it.

Check the linked specification for its direction, combination rules, caching behavior, and security considerations before generating or trusting it.

IANA registry: http-fields/field-names · structured type: Item

Registry reference: HTML

Permalink: https://merginit.com/reference/http/field-registry-cross-origin-opener-policy-report-only