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A list-like interface that allows iterating over headers as byte-pairs
of (lowercased-name, value).
Internally we actually store the representation as three-tuples,
including both the raw original casing, in order to preserve casing
over-the-wire, and the lowercased name, for case-insensitive comparisions.
r = Request(
method="GET",
target="/",
headers=[("Host", "example.org"), ("Connection", "keep-alive")],
http_version="1.1",
)
assert r.headers == [
(b"host", b"example.org"),
(b"connection", b"keep-alive")
]
assert r.headers.raw_items() == [
(b"Host", b"example.org"),
(b"Connection", b"keep-alive")
]
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