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Guess the "Content-Type" of a file.
:param filename:
The filename to guess the "Content-Type" of using :mod:`mimetypes`.
:param default:
If no "Content-Type" can be guessed, default to `default`.
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Helper function to format and quote a single header parameter using the
strategy defined in RFC 2231.
Particularly useful for header parameters which might contain
non-ASCII values, like file names. This follows RFC 2388 Section 4.4.
:param name:
The name of the parameter, a string expected to be ASCII only.
:param value:
The value of the parameter, provided as ``bytes`` or `str``.
:ret:
An RFC-2231-formatted unicode string.
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