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    werkzeug.urls
    ~~~~~~~~~~~~~

    ``werkzeug.urls`` used to provide several wrapper functions for Python 2
    urlparse, whose main purpose were to work around the behavior of the Py2
    stdlib and its lack of unicode support. While this was already a somewhat
    inconvenient situation, it got even more complicated because Python 3's
    ``urllib.parse`` actually does handle unicode properly. In other words,
    this module would wrap two libraries with completely different behavior. So
    now this module contains a 2-and-3-compatible backport of Python 3's
    ``urllib.parse``, which is mostly API-compatible.

    :copyright: 2007 Pallets
    :license: BSD-3-Clause
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    :exc:`HTTPUnicodeError` is raised.

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    >>> url_fix(u'http://de.wikipedia.org/wiki/Elf (Begriffskl\xe4rung)')
    'http://de.wikipedia.org/wiki/Elf%20(Begriffskl%C3%A4rung)'

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    'http://\u2603.net/p\xe5th?q=\xe8ry%DF'

    :param uri: The URI to convert.
    :param charset: The encoding to encode unquoted bytes with.
    :param errors: Error handler to use during ``bytes.encode``. By
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    'http://xn--n3h.net/p%C3%A5th?q=%C3%A8ry%DF'

    :param iri: The IRI to convert.
    :param charset: The encoding of the IRI.
    :param errors: Error handler to use during ``bytes.encode``.
    :param safe_conversion: Return the URL unchanged if it only contains
        ASCII characters and no whitespace. See the explanation below.

    There is a general problem with IRI conversion with some protocols
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        magnet:?xt=uri:whatever
        itms-services://?action=download-manifest

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    .. versionchanged:: 0.15
        All reserved characters remain unquoted. Previously, only some
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       The ``safe_conversion`` parameter was added.

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