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| """HTTP Header field registrations. | |
| According to ``RFC 4229 : HTTP Header Fields`` by Nottingham & Mogul at December 2005. | |
| Refer to https://tools.ietf.org/html/rfc4229 . | |
| """ | |
| _PermanentHdrFields = frozenset([ | |
| # Permanent HTTP Header field registrations. | |
| 'A-IM', |