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Checks whether a given file-like object is closed.
:param obj:
The file-like object to check.
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Asserts whether all headers have been successfully parsed.
Extracts encountered errors from the result of parsing headers.
Only works on Python 3.
:param headers: Headers to verify.
:type headers: `httplib.HTTPMessage`.
:raises urllib3.exceptions.HeaderParsingError:
If parsing errors are found.
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Checks whether the request of a response has been a HEAD-request.
Handles the quirks of AppEngine.
:param conn:
:type conn: :class:`httplib.HTTPResponse`
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