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Provides a thread-safe dict-like container which maintains up to
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:param headers:
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A ``dict`` like container for storing HTTP Headers.
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RFC 7230. Iteration provides the first case-sensitive key seen for each
case-insensitive pair.
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case-insensitively in order to maintain ``dict``'s api. For fields that
compare equal, instead create a new ``HTTPHeaderDict`` and use ``.add``
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