Enforce lower-kebab-case for resource http headers#363
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BenoitZugmeyer
approved these changes
Mar 4, 2026
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Summary
Add a propertyNames constraint to both request.headers and response.headers in the resource schema, ensuring all header keys follow lowercase kebab-case format (e.g. content-type, x-request-id).
Motivation
HTTP header names collected in RUM resource events should be normalized to lowercase kebab-case for consistency. This schema-level validation prevents ingestion of headers with mixed casing (e.g. Content-Type) or non-standard separators (e.g. x_request_id), ensuring uniform keys across all resource events.
Changes
schemas/rum/resource-schema.json: Added propertyNames.pattern set to ^[a-z][a-z0-9](-[a-z0-9]+)$ on the headers object in both resource.request and resource.response.