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    Guess the "Content-Type" of a file.

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    Helper function to format and quote a single header parameter.

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    A data container for request body parameters.

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        A :class:`~urllib3.fields.RequestField` factory from old-style tuple parameters.

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        Overridable helper function to format a single header parameter.

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        Helper function to format and quote a single header.

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        Makes this request field into a multipart request field.

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