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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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For example::
'foo': 'bar',
'fakefile': ('foofile.txt', 'contents of foofile'),
'realfile': ('barfile.txt', open('realfile').read()),
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Helper function to format and quote a single header.
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Renders the headers for this request field.
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Makes this request field into a multipart request field.
This method overrides "Content-Disposition", "Content-Type" and
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The 'Content-Type' of the request body.
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