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Showing content from http://www.iana.org/assignments/message-headers/ below:

Message Headers

Message Headers
Last Updated
2025-05-02
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Registries Included Below

Permanent Message Header Field Names
Registration Procedure(s)
Expert Review
Expert(s)
Mark Baker (primary), Murray Kucherawy (backup)
Reference
[RFC3864][RFC-ietf-emailcore-rfc5322bis-12]
Note
[RFC5504] specified that no new header fields be registered that begin with "Downgraded-". 
That restriction is now lifted, per [RFC6857].
Note
HTTP field name registrations have been moved to [https://www.iana.org/assignments/http-fields] 
per [RFC9110].
    
Available Formats

CSV
Provisional Message Header Field Names
Registration Procedure(s)
Expert Review
Expert(s)
Mark Baker (primary), Murray Kucherawy (backup)
Reference
[RFC3864][RFC-ietf-emailcore-rfc5322bis-12]
Note
Registration of a Provisional Message Header Field does not of itself imply any kind of 
endorsement by the IETF, IANA or any other body.
Note
HTTP field name registrations have been moved to [https://www.iana.org/assignments/http-fields] 
per [RFC9110].
    
Available Formats

CSV
Content-Translation-Type Header Field Values
Registration Procedure(s)
Specification Required
Expert(s)
Nik Tomkinson
Reference
[RFC8255]
Available Formats

CSV

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